Testosterone, gender identity and gender-stereotyped personality attributes.

Sex/gender differences in personality associated with gender stereotyped behavior are widely studied in psychology yet remain a subject of ongoing debate. Exposure to testosterone during developmental periods is considered to be a primary mediator of many sex/gender differences in behavior. Extensions of this research has led to both lay beliefs and initial research about individual differences in basal testosterone in adulthood relating to "masculine" personality. In this study, we explored the relationships between testosterone, gender identity, and gender stereotyped personality attributes in a sample of over 400 university students (65 % female assigned at birth). Participants provided ratings of their self-perceived masculinity and femininity, resulting in a continuous measure of gender identity, and a set of agentic and communal personality attributes. A saliva sample was also provided for assay of basal testosterone. Results showed no compelling evidence that basal testosterone correlates with gender-stereotyped personality attributes or explains the relationship between sex/gender identity and these attributes, across, within, or covarying out sex assigned at birth. Contributing to a more gender diverse approach to assessing sex/gender relationships with personality and testosterone, our continuous measure of self-perceived masculinity and femininity predicted additional variance in personality beyond binary sex and showed some preliminary but weak relationships with testosterone. Results from this study cast doubt on the activational testosterone-masculinity hypothesis for explaining sex differences in gender stereotyped traits and within-sex/gender variation in attributes associated with agency and communality.

Self-perceptions of masculinities and testicular cancer: Qualitative explorations.

OBJECTIVE: Masculinities have been explored in men with testicular cancer (TC), though limited contemporary research is available on traditional masculine norms important to masculine self-perception. The purpose of this research was to explore the discourse of TC experience in relation to masculine self-perception. METHODS: A qualitative descriptive study was conducted consisting of semi-structured interviews with 21 men. Men were aged between 31 and 47 (Mage = 35.7). Most men were diagnosed with Stage 1 cancer (66.6%), all men had finished active treatment and time since diagnosis ranged from 17.3 to 71.8 months (M = 47.2). Independent coding was conducted by two researchers and was refined in coding meetings with authors. Themes were developed in a predominantly deductive manner, and analysis of themes was undertaken using a reflexive analysis approach. RESULTS: Traditional masculine norms showed differing relationships to masculine self-perception. Two main themes were identified [1] Maintained or enhanced masculine self-perception and [2] threats to masculine self-perception. Subthemes demonstrated that maintaining emotional control, strength and 'winning' was important to men, and reduced physical competencies (i.e., strength, sexual dysfunction, virility) challenged self-perception. Strict adherence to traditional norms in response to threatened self-perception related to psychological distress. CONCLUSION: Leveraging traditionally masculine norms such as physical strength and control and developing flexible adaptations of masculinities should be encouraged with men with TC to retain self-perception and potentially enable better coping. Masculine self-perception of gay/bisexual men may centre around sexual functioning, though further research is required.

Malignancy, masculinities, and psychological distress: Comparisons made between men with testicular cancer and healthy controls.

OBJECTIVE: Psychological distress is common in men with testicular cancer (TC), and masculinities may work to explain this. This study aimed to compare masculinities and distress in TC and healthy control (HC) populations and explore relationships between correlates of distress (psychological flexibility and coping style) and masculinities in TC. METHODS: A cross-sectional, online survey was completed by 92 men with TC (Mage  = 34.8) and 90 HC (Mage  = 30.7). Measures included psychological distress (Patient-Reported Outcomes Measurement Information System Depression/Anxiety, fear of cancer recurrence inventory-short form), masculinities (gender role conflict-short form, inventory of subjective masculinity experiences/subjective masculinity stress scale, masculinity in chronic disease inventory), coping style (mini-mental adjustment to cancer ) and psychological flexibility (comprehensive assessment of acceptance commitment therapy). Linear regressions were conducted to compare groups and analyse associations. RESULTS: There were no differences in masculinities or psychological distress between populations (all p > 0.05 and all Cohen's d < 0.20), except for subjective masculine stress and restrictive affectionate behaviour between men. For men with TC, restrictive affection/emotion, conflicts between family/work and subjective masculine stress were associated with psychological distress (rs 0.21-0.58). Optimistic action was negatively associated with depression/anxiety, helplessness/hopelessness coping (rs -0.27 to -0.42) and positively associated with psychological flexibility (r = 0.35). CONCLUSIONS: Masculinities are implicated in psychological distress in men with TC. Psychological flexibility as well as leveraging masculine beliefs (e.g., optimistic action) may be modifiable targets to reduce distress in men with TC.

Beyond femininity or masculinity: gender typologies and healthy eating in early adulthood.

PURPOSE: In the field of health sciences gender is often confused with biological sex (male/female) or reduced to a dichotomous classification (masculinity/femininity). The concepts of sex and gender interact with each other, but they are not equivalent. According to Sandra Bem four gender typologies can be established (androgynous, masculine, feminine and undifferentiated). A relationship has been shown to exist between gender and health. Yet, there is little evidence as to the relationship between gender typologies and adherence to the Mediterranean diet. The aim of this research is to evaluate the association between Bem's gender typologies and adherence to the Mediterranean diet. METHODS: Mediterranean Diet Adherence Screener (MEDAS) and Bem's gender typologies were the main variables. Sex, age, socioeconomic status (SES), body mass index (BMI) and obesity were analyzed as covariates. RESULTS: Multilevel multivariate analysis showed that androgynous typology was associated with increased adherence to Mediterranean diet (ß = 0.46 (SE 0.21), p = 0.033), adjusting by covariates, in a university population in Spain. Moreover, this was not the case with masculinity or femininity typologies. CONCLUSION: Thus, the results of this study suggest (1) that androgynous typology is not only associated with better mental health but also with healthy/healthier lifestyles, and (2) the complexity of the relationship between sex-gender and health would advise researchers avoid dichotomies such as male/female or masculinity/femininity.

Proto-Endocrinological Theories of Masculinity/Femininity (1490-1904).

From the mid-seventeenth century, resorption of a testicular "ferment" and resorption of some part of the semen constituted reputable accounts of secondary sexual characteristics. Only in the early twentieth century was the latter, "recrementitious secretion" theory, explicitly considered superseded by one of internal secretion, an advance ushering in the hormone era. A reconstruction of these proto-endocrinological concepts is offered onward from the first, 1490 print edition of Galen's On Semen. Early modern physicians picking up from Galen deliberated widely on the medium and pathway of male and female testicular influences on "the entire body," including the mind, causing "femininity" and "masculinity" in physical, mental-temperamental, and behavioral terms. A switch is discernible from "heat and strength" (Galen) to blood-borne "virility" or testicular vapor (such as proposed in 1564 by Tomás Rodrigues da Veiga), to iatrochemical postulations of a "seminal ferment" (suggested in the late 1650s, perhaps independently, by Thomas Willis at Oxford and Lambert van Velthuysen in Utrecht), finally to a "seminal recrement" or "reabsorbed semen" concept soon after (emergent in the posthumous work of Giovanni Alfonso Borelli, among others). During the late eighteenth century, mounting controversy surrounded both the very idea of that concept and the involved anatomical pathways, informed by multiple experiments.

Gender Roles and Mobile Dating Applications: Exploring Links Between User Characteristics and Traditional Gender Expressions in Self-Presentations.

This linkage study examined the prevalence of traditional gender expressions in the textual and visual profile cues on mobile dating applications (MDA) (nbiographies = 396, npictures = 1352) of 396 young adults' (Mage = 22.39 years, SD = 2.86, 73% women) with attention to users' gender, sexual orientation, and platform type. For 184 users (Mage = 22.10 years, SD = 2.91, 75% women) media content data were linked to self-report survey data. Results showed that individuals aligned their self-presentations with traditional gender roles and expectations, and this link depended on their gender. No significant differences according to individuals' sexual orientation or platform type were found. Individuals' (hyper-) gender orientation also related to engagement in traditional gender expressions. Specifically, women with a stronger feminine gender orientation expressed more traditional femininity in their MDA profiles. For men, no significant associations between (aspects of) a masculine gender orientation and expressing traditional masculinity in their MDA profiles were found. Future research should further disentangle selective gendered self-presentations.

Social Perceptions of Masculinity and Sexual Esteem Are Impacted by Viagra Use, Testosterone, and Sexual Performance.

Sexual behaviors play a role in the social construction of masculinity. Moreover, this stereotype has been capitalized upon by pharmaceutical companies, as well as those that sell products not approved by the U.S. Food and Drug Administration, for purposes of marketing sexual medicines. Stereotypical notions of masculinity, however, also emphasize the importance of self-reliance, which may cause some to look unfavorably upon the use of sexual medicine. Consistent with this notion, a male target was viewed as more masculine when his female partner consistently reached orgasm, unless he had no history of erectile dysfunction (ED), but was taking Viagra anyway (Experiment 1; N = 522). In addition, when his partner consistently reached orgasm, ratings of his sexual esteem were also lower if he used Viagra than if he did not, but only if he had no history of ED. In Experiment 2 (N = 711), although there was no effect of a male target's use of testosterone, social perception of his masculinity and sexual esteem increased as his "natural" levels of testosterone increased. In addition, exploratory analysis revealed that if the male target had low (but not normal or high) "natural" levels of testosterone, ratings of his masculinity were higher if his female partner consistently had an orgasm, which suggests that female orgasm served to "rescue" masculinity. Because expectations about drugs drive their use, it is important to address preconceived notions about the use of sexual medicines for purposes of enhancing masculinity and sexual esteem, as the social perception of their use is much more complex.

Self-Rated Masculinity and Femininity and Reported Number of Lifetime Sexual Partners Among Cisgender Heterosexual and LGBQ Men and Women.

Prior research has quantitatively examined why heterosexual men and women report different numbers of lifetime different-sex sexual partners, whereas qualitative work has analyzed how men's masculinity-and to a lesser extent, women's femininity-is tied to gender norms about sexual activity. Less research, however, has quantitatively examined the associations between self-rated masculinity and femininity and reported number of lifetime sexual partners. This brief report uses a large sample of Canadians (n = 2117) to examine how self-rated masculinity and femininity relate to reported numbers of sexual partners among four groups of cisgender people: (1) heterosexual men (n = 972), (2) heterosexual women (n = 979), (3) gay and bisexual/pansexual men (n = 99), and (4) lesbian and bisexual/pansexual women (n = 67). Results demonstrate that self-rated femininity was negatively, and masculinity positively, associated with reported numbers of lifetime different-sex sexual partners among heterosexual women. No significant associations emerged for other groups. The lack of significant associations among heterosexual men may be attributable to the fact that most rated themselves as very masculine and not very feminine, whereas there was more variation among heterosexual women. In contrast, the non-significance among LGBQ women and men could reflect that subcultural norms and practices more strongly shape the number of sexual partners individuals report having in these communities. These results demonstrate that it would be beneficial for researchers to measure self-rated masculinity and femininity in future studies about sexual partnering practices, especially among heterosexual cisgender women.

Value-related attitudes towards mental health problems and help-seeking barriers: a sequential mixed-methods design investigating participants with reported depressive episodes in rural Northern Germany with and without treatment experience.

BACKGROUND: Seeking help for severe depressive symptoms remains a major obstacle for particular groups within the general population. Value-related attitudes might contribute to this treatment gap, particularly in rural regions with a low density of psychiatric-psychotherapeutic services. We aimed to investigate narratives of socialization, value systems, and barriers of help-seeking to better understand social milieus at increased risk for underuse of psychiatric-psychotherapeutic services in a rural area in East Germany. This could complement the explanatory power of classical socio-demographic determinants and provide guidance for possible interventions. METHOD: Based on results of an analysis of a population-based German cohort study (SHIP-TREND-1), 20 individual semi-structured interviews were conducted with participants who met criteria for having been moderately or severely depressed at least once in their life. Qualitative analyses of interview data were guided by grounded theory methodology. RESULTS: Participants with severe symptoms of depression were more frequent among non-responders of this study. We identified key aspects that influence help-seeking for mental health problems and seem to be characteristic for rural regions: family doctors serve as initial contact points for mental health problems and are considered as alternatives for mental health professionals; norms of traditional masculinity such as being more rational than emotional, needing to endure hardships, embodying strength, and being independent were frequently mentioned as inhibiting help-seeking by middle-aged men; anticipated adverse side-effects of therapy such as worsening of symptoms; a frequently expressed desire for less pathologically perceived treatment options. CONCLUSIONS: Our results suggest that barriers regarding help-seeking in rural regions are multifaceted and seem to be influenced by traditional norms of masculinity. We believe it is critical to strengthen existing and already utilized services such as family doctors and to implement and evaluate tailored interventions targeting the needs of the rural milieu.

Intersecting identities, diverse masculinities, and collaborative development: Considerations in creating online mental health interventions that work for men.

Online mental health interventions have received attention for their potential to bypass barriers that stop men from seeking mental health help from a health professional. However, emerging data suggest that men's use of online mental health interventions is low, and when used, early attrition is common. In this commentary, we hypothesise that men's common lack of engagement with online mental health interventions may reflect limited attention being paid to the needs and preferences of potential users during their development. We outline a series of considerations that we believe are important to advance the development of acceptable, effective online mental health interventions for men: (1) men's diverse and intersecting characteristics, circumstances, and needs; (2) centring positive, progressive masculinities; and (3) listening to, learning from, and working in partnership with men to develop interventions. We also examine how existing online mental health interventions targeting men have engaged with these considerations. Keywords: men, male, mental health, e-mental health, digital health, online interventions.

Facial cues to physical strength are not always associated with facial masculinity: Comparative study of Europeans and Southern Siberians.

OBJECTIVES: The aim of our study was to compare morphometric patterns of facial sexual dimorphism with strength-face relationship in members of two distinct populations of European and Central Asian origin: Russians and Tuvans. METHODS: Handgrip strength (HGS) measures and facial photographs were collected from Russian (n = 233) and Tuvan (n = 187) men and women. We digitized 70 landmarks and semilandmarks on full-face and 54 landmarks and semilandmarks on profile photos. This was done to capture variation in facial morphology. After that, we performed the shape regressions of landmarks' coordinates upon sex and HGS. Results were visualized in forms of thin-plate deformation grids and geometric morphometric morphs. RESULTS: In both populations, HGS was associated significantly with male facial shape only. In Russian men, strength-related changes of facial shape were almost completely in direction of increase in male-typicality. This was especially evident for the relative lower facial width, which was higher in men compared to women, as well as in stronger men compared to weaker ones. On the contrary, in Tuvans the lower face was relatively narrower in men than in women. However, the facial shape of strong Tuvan men was also associated with relatively wider lower face. Our results indicate that the effect of strength on facial shape is relatively independent of facial sexual dimorphism. CONCLUSIONS: Our findings clearly demonstrate that physical strength is associated with the shape of the lower part of male faces even in populations with a mismatched direction of lower face sexual dimorphism.

Hegemonic masculinity predicts 2016 and 2020 voting and candidate evaluations.

This work examined whether the endorsement of the culturally idealized form of masculinity-hegemonic masculinity (HM)-accounted for unique variance in men's and women's support for Donald Trump across seven studies (n = 2,007). Consistent with our theoretical backdrop, in the days (Studies 1 and 2) and months (Studies 3 through 6) following the 2016 American presidential election, women's and men's endorsement of HM predicted voting for and evaluations of Trump, over and above political party affiliation, gender, race, and education. These effects held when controlling for respondents' trust in the government, in contrast to a populist explanation of support for Trump. In addition, as conceptualized, HM was associated with less trust in the government (Study 3), more sexism (Study 4), more racism (Study 5), and more xenophobia (Study 6) but continued to predict unique variance in evaluations of Trump when controlling for each of these factors. Whereas HM predicted evaluations of Trump, across studies, social and prejudiced attitudes predicted evaluations of his democratic challengers: Clinton in 2016 and Biden in 2020. We replicate the findings of Studies 1 through 6 using a nationally representative sample of the United States (Study 7) 50 days prior to the 2020 presidential election. The findings highlight the importance of psychological examinations of masculinity as a cultural ideology to understand how men's and women's endorsement of HM legitimizes patriarchal dominance and reinforces gender, race, and class-based hierarchies via candidate support.

The relationships of sexually harassing behaviors to organizational context factors and working men's dark personality traits.

This research examined the roles of organization contexts factors and dark personality traits in men's (N = 600) self-reports of sexually harassing behaviors toward women in the workplace. Four organization context factors (a permissive climate, a masculinized job/gender context, male/female contact, and Masculinity Contest Culture [MCC] Norms) and four dark personality traits (psychopathy, narcissism, Machiavellianism, and sadism) were examined. While only one organizational context factor, MCC Norms correlated with men's admissions of sexually harassing behaviors at work, all four dark personality traits evidenced significant correlations. In a multiple regression analysis, MCC Norms emerged again as the single organizational context predictor and psychopathy as the single personality predictor of men's admissions of sexually harassing behaviors at work. Moderation analyses showed that a masculinized job/gender context interacted with psychopathy to produce more admissions of sexually harassing behaviors. Mediation analyses showed that psychopathy, narcissism, and Machiavellianism had indirect relationships with admissions of sexually harassing behaviors through MCC Norms. Higher levels on these traits were related to higher levels of these workplace norms which, in turn, predicted more admissions of sexually harassing behavior. This research sheds new light on how both organizational contexts and enduring personal characteristics of men are related to sexual harassment in the workplace.

Sibling and peer bullying victimization in adolescence: Masculinity, femininity, and the moderating role of sex and popularity.

INTRODUCTION: We investigated whether gender-typed traits (masculinity and femininity) contemporaneously predicted self-reported peer victimization, peer-reported peer victimization, and sibling victimization. We also tested the moderating role of sex and popularity. METHODS: A sample of 2782 British pupils aged 11-16 from Central England, UK was screened for bullying involvement and popularity using self-report and peer nominations, and a subsample of 704 (52.7% girls) completed a measure of gender-typed traits (masculinity and femininity). RESULTS: Hierarchical multiple regression analyses revealed that low levels of masculine traits were associated with greater risk of self-reported peer victimization, there were no associations with peer-reported peer victimization, and low levels of feminine traits were associated with greater risk of self-reported sibling victimization. The effects were not moderated by sex, while popularity decreased the risk of self- and peer-reported peer victimization. CONCLUSIONS: Bullying prevention interventions could benefit from including the positive facets of feminine and masculine traits.

Acoustic cues to femininity and masculinity in spontaneous speech.

The perceived level of femininity and masculinity is a prominent property by which a speaker's voice is indexed, and a vocal expression incongruent with the speaker's gender identity can greatly contribute to gender dysphoria. Our understanding of the acoustic cues to the levels of masculinity and femininity perceived by listeners in voices is not well developed, and an increased understanding of them would benefit communication of therapy goals and evaluation in gender-affirming voice training. We developed a voice bank with 132 voices with a range of levels of femininity and masculinity expressed in the voice, as rated by 121 listeners in independent, individually randomized perceptual evaluations. Acoustic models were developed from measures identified as markers of femininity or masculinity in the literature using penalized regression and tenfold cross-validation procedures. The 223 most important acoustic cues explained 89% and 87% of the variance in the perceived level of femininity and masculinity in the evaluation set, respectively. The median fo was confirmed to provide the primary cue, but other acoustic properties must be considered in accurate models of femininity and masculinity perception. The developed models are proposed to afford communication and evaluation of gender-affirming voice training goals and improve voice synthesis efforts.

Auditory free classification of gender diverse speakersa).

Auditory attribution of speaker gender has historically been assumed to operate within a binary framework. The prevalence of gender diversity and its associated sociophonetic variability motivates an examination of how listeners perceptually represent these diverse voices. Utterances from 30 transgender (1 agender individual, 15 non-binary individuals, 7 transgender men, and 7 transgender women) and 30 cisgender (15 men and 15 women) speakers were used in an auditory free classification paradigm, in which cisgender listeners classified the speakers on perceived general similarity and gender identity. Multidimensional scaling of listeners' classifications revealed two-dimensional solutions as the best fit for general similarity classifications. The first dimension was interpreted as masculinity/femininity, where listeners organized speakers from high to low fundamental frequency and first formant frequency. The second was interpreted as gender prototypicality, where listeners separated speakers with fundamental frequency and first formant frequency at upper and lower extreme values from more intermediate values. Listeners' classifications for gender identity collapsed into a one-dimensional space interpreted as masculinity/femininity. Results suggest that listeners engage in fine-grained analysis of speaker gender that cannot be adequately captured by a gender dichotomy. Further, varying terminology used in instructions may bias listeners' gender judgements.

Exploring men's struggles with infertility: A qualitative content analysis.

AIM: To investigate the experiences of men struggling with infertility. DESIGN: This is a qualitative study, and the report follows the COREQ checklist. METHODS: A team of nurse researchers conducted this research in Iran to examine the experiences of 11 men with primary infertility. The participants were selected through targeted sampling and underwent in-depth semi-structured interviews. The data collected was analysed using the conventional content analysis method outlined by Krippendorff. To ensure the study's accuracy, it followed the criteria proposed by Lincoln and Guba. RESULTS: The central theme, "the threat to masculinity," was identified upon analysis. It comprises six categories: psychological pressure of confronting reality, frustration, discomfort with others, holding out against ridicule, tolerating unwanted opinions and advice and concealment of infertility and therapy. CONCLUSION: This study brings attention to the challenge to masculinity that men with primary infertility face as their central struggle. It highlights the importance of culturally sensitive care from healthcare professionals, emotional support, counselling services and public awareness to reduce the stigma surrounding male infertility. It can be valuable to evaluate and enhance infertility care in various settings. IMPLICATIONS FOR THE PROFESSION AND PATIENT CARE: To provide the best possible care for infertile men, it would be beneficial for nurses to pay more attention to sociocultural factors. Fertility care should be respectful of patients' beliefs and backgrounds. IMPACT: WHAT PROBLEM DID THE STUDY ADDRESS?: Infertility care has been the subject of recent research, focusing on the impact of sociocultural factors. Male-factor infertility is often overlooked in clinical care literature. There is a correlation between cultural background and men's acceptance of reproductive healthcare. WHAT WERE THE MAIN FINDINGS?: Male infertility is often avoided in discussions due to its perceived threat to masculinity. Multiple factors, including societal norms, cultural expectations and personal experiences, influence the nature of men's struggles with infertility. Providing emotional support and counselling services is crucial so that men can openly discuss their fertility challenges and seek treatment without feeling ashamed or judged. WHERE AND ON WHOM WILL THE RESEARCH HAVE AN IMPACT?: Raising public awareness and providing education about male infertility is crucial. Nurses must exhibit cultural sensitivity while caring for men experiencing infertility. Policymakers need to implement strategies to reduce the stigma surrounding male infertility. REPORTING METHOD: The study is reported using the Consolidated Criteria for Reporting Qualitative Research (COREQ). PATIENT OR PUBLIC CONTRIBUTION: No public or patient involvement.

'That Sounds to Me Like You Are Making This Too Complicated ': Reflections on a Social Media Recruitment Effort for a Study on Masculinities and Contraception.

This reflection focuses on the methodological and ethical challenges encountered during the recruitment stage in a focus group and interview study that sought to investigate how men (co-)construct (their) masculinity in the context of contraception and family planning. We critically engage with the comments sections of our social media recruitment announcements and draw lessons in regard to (i) the 'correct' and socially acceptable terminology when trying to recruit men in an inclusive manner and (ii) the feasibility of our method more generally. We asked what we may learn about ourselves, our specific research project, and the conduct of research more generally when we view the ethical challenges arising during the recruitment stage as an integral part of reflexive research ethics.

Gendered mourning: A perspective of Akan death culture in Ghana.

Death is the commonest, incomprehensible, and inescapable reality confronting humanity in all nations and cultures. However, cultures vary in their conceptions of death, grieving and mourning rituals. Among the Akan of Ghana, mourning and funeral obsequies are essential cultural and spiritual practices. In this article, we draw insights from our reflective lived experiences and critical literature review to explore mourning and death rituals among the Akan as a stratified cultural system that reflects and reproduces broader gender patterns of masculinity and femininity in Ghana. We discuss the concept and cultural significance of mourning and bereavement practices, and further examine how socio-cultural notions of gender shape mourning and death rituals in Ghana. We argue that, as in many social and economic spaces in Ghana, funeral obsequies and bereavement practices represent sites for enacting and reproducing masculinity and femininity. The deleterious health and psychological consequences for men and women are further discussed.

Endorsement of Masculine-Typed Behaviors Decreases During Middle Adolescence: The Contextualizing Role of Peer Experiences for Adolescents Living in the United States.

While more research is emerging about the development of masculinity during adolescence, not much is known about how masculine-type behaviors develop over time in middle to late adolescence within the context of friendships and peer experiences. This study examined trajectories of masculine-typed behavior from ages 14 to 17. Multilevel modeling was used to account for cross-time and within-time variability in masculine-typed behavior and examined the role of positive and negative peer experiences in predicting this variability. This was done in a sample of 334 U.S. adolescents (51% boys; 50% White, 19% Black, 15% Latina/o/e). At the between-person level, boys and girls decreased in masculine-typed behavior over time. At the within-person level, negative peer experiences predicted fluctuations toward greater masculine-typed behavior, whereas friend support predicted fluctuations toward less masculine-typed behavior. Adolescence is a key period for navigating masculinity norms, and peer experiences are a key context for the development of masculine-typed behavior.