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In multicellular organisms, sexed gonads have evolved that facilitate release of sperm versus eggs, and bilaterian animals purposefully combine their gametes via mating behaviors. Distinct neural circuits have evolved that control these physically different mating events for animals producing eggs from ovaries versus sperm from testis. In this review, we will describe the developmental mechanisms that sexually differentiate neural circuits across three major clades of bilaterian animals-Ecdysozoa, Deuterosomia, and Lophotrochozoa. While many of the mechanisms inducing somatic and neuronal sex differentiation across these diverse organisms are clade-specific rather than evolutionarily conserved, we develop a common framework for considering the developmental logic of these events and the types of neuronal differences that produce sex-differentiated behaviors. This article is categorized under: Congenital Diseases > Stem Cells and Development Neurological Diseases > Stem Cells and Development.
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Sêmen , Diferenciação Sexual , Masculino , Animais , Reprodução , Células Germinativas , EspermatozoidesRESUMO
BACKGROUND: Sexual minority men (SMM) experience higher suicidal ideation and suicide attempts than the general population. We examined the associations of adverse childhood experiences (ACES) and protective and compensatory childhood experiences (PACES) with suicidal ideation and suicide attempts in adulthood via thwarted belongingness and perceived burdensomeness among SMM. METHODS: Data are from the UNITE study, a national longitudinal cohort study of HIV-negative SMM from the 50 U.S. states and Puerto Rico. Between 2017 and 2019, participants (N = 6303) completed web-based assessments at baseline and 12-month follow-up. ACES and PACES occurring before the age of 18, and current symptoms of thwarted belongingness and perceived burdensomeness were assessed at baseline. Past-week suicidal ideation and past-year suicide attempt were assessed at follow-up. RESULTS: 424 (6.7%) participants reported past-week suicidal ideation and 123 (2.0%) reported a past-year suicide attempt. The results of our multivariate model suggest that each additional adverse childhood experience was prospectively associated with 14% higher odds of past-week suicidal ideation (AOR = 1.14, 95% CI 1.09-1.19) and 19% higher odds of past-year suicide attempt (AOR = 1.19, 95% CI 1.11-1.29). Each additional protective childhood experience was prospectively associated with 15% lower odds of past-week suicidal ideation (AOR = 0.85, 95% CI 0.81-0.90) and 11% lower odds of past-year suicide attempt (AOR = 0.89, 95% CI 0.82-0.98). Perceived burdensomeness partially mediated these prospective associations. CONCLUSION: To reduce suicide, screening and treating perceived burdensomeness among SMM with high ACES may be warranted. PACES may decrease perceived burdensomeness and associated suicide risk.
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Relações Interpessoais , Tentativa de Suicídio , Masculino , Humanos , Estudos Longitudinais , Ideação Suicida , Fatores de Risco , Teoria PsicológicaRESUMO
This study examined associations between structural racism, anti-LGBTQ policies, and suicide risk among young sexual minority men (SMM). Participants were a 2017-2018 Internet-based U.S. national sample of 497 Black and 1536 White SMM (ages 16-25). Structural equation modeling tested associations from indicators of structural racism, anti-LGBTQ policies, and their interaction to suicide risk factors. For Black participants, structural racism and anti-LGBTQ policies were significantly positively associated with depressive symptoms, heavy drinking, perceived burdensomeness, thwarted belongingness, self-harm, and suicide attempt. There were significant interaction effects: Positive associations between structural racism and several outcomes were stronger for Black participants in high anti-LGBTQ policy states. Structural racism, anti-LGBTQ policies, and their interaction were not significantly associated with suicide risk for White SMM.
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Minorias Sexuais e de Gênero , Suicídio , Adolescente , Adulto , Humanos , Masculino , Relações Raciais , Ideação Suicida , Tentativa de Suicídio , Adulto JovemRESUMO
INTRODUCTION: Although evidence indicates that Black gay, bisexual, and other sexual minority men experience vast psychological and behavioral health inequities, most research has focused on individual rather than structural drivers of these inequities. This study examines the associations between structural racism and anti-lesbian, gay, bisexual, transgender, and queer policies and the psychological and behavioral health of Black and White sexual minority men. METHODS: Participants were an Internet-based U.S. national sample of 1,379 Black and 5,537 White sexual minority men during 2017-2018. Analysis occurred in 2019-2020. Structural equation modeling tested the associations from indicators of structural racism, antiâlesbian, gay, bisexual, transgender, and queer policies, and their interaction to anxiety symptoms, depressive symptoms, perceived burdensomeness, heavy drinking, and HIV testing frequency. Separate models for Black and White sexual minority men adjusted for contextual and individual covariates. RESULTS: For Black participants, structural racism was positively associated with anxiety symptoms (ß=0.20, SE=0.10, p=0.04), perceived burdensomeness (ß=0.42, SE=0.09, p<0.001), and heavy drinking (ß=0.23, SE=0.10, p=0.01). Antiâlesbian, gay, bisexual, transgender, and queer policies were positively associated with anxiety symptoms (ß=0.08, SE=0.04, p=0.03), perceived burdensomeness (ß=0.20, SE=0.04, p<0.001), and heavy drinking (ß=0.10, SE=0.04, p=0.01) and were negatively associated with HIV testing frequency (ß= -0.14, SE=0.07, p=0.04). Results showed significant interaction effects, such that the positive associations between structural racism and both perceived burdensomeness (ß=0.38, SE=0.08, p≤0.001) and heavy drinking (ß=0.22, SE=0.07, p=0.003) were stronger for individuals living in states with high levels of antiâlesbian, gay, bisexual, transgender, and queer policies. Neither of the oppression variables nor their interaction was significantly associated with outcomes for White sexual minority men. CONCLUSIONS: Results highlight the intersectional nature of structural oppression and suggest that racist and anti-lesbian, gay, bisexual, transgender, and queer policies must be repealed to rectify health inequities facing Black sexual minority men.
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Negro ou Afro-Americano , Minorias Sexuais e de Gênero , Bissexualidade , Humanos , Masculino , Saúde do Homem , Comportamento SexualRESUMO
Research suggests that the science of undetectable viral load (VL) status and HIV transmission-conveyed with the slogan "Undetectable = Untransmittable" or "U = U"-has gaps in acceptance despite robust scientific evidence. Nonetheless, growing acceptance of U = U creates conditions for a shift in the sociopolitical and personal implications of viral suppression. We conducted an online survey over a 23-month period in 2018 and 2019 among 30,361 adolescent and adult (aged 13-99) sexual minority men living with HIV (SMM-LHIV) across the United States. We examined the impact of U = U on self-image, potential for changing societal HIV stigma, whether SMM-LHIV had ever spoken with a provider about viral suppression and HIV transmission, and primary sources of hearing about U = U. Approximately 80% of SMM-LHIV reported that U = U was beneficial for their self-image and societal HIV stigma, 58.6% reported it made them feel "much better" about their own HIV status, and 40.6% reporting it had the potential to make HIV stigma "much better." The most consistent factors associated with these beliefs centered around care engagement, particularly self-reported viral suppression and excellent antiretroviral therapy adherence. Two-thirds reported ever talking to a provider about VL and HIV transmission, although the primary sources for having heard about U = U were HIV and lesbian, gay, bisexual, transgender, and queer (LGBTQ) news media and personal profiles on networking apps. These findings demonstrate the significant personal and social importance of U = U for SMM-LHIV that go above-and-beyond the well-documented health benefits of viral suppression, suggesting that providers should consider routinely initiating conversations with patients around the multifaceted benefits (personal health, sexual safety and intimacy, increased self-image, and reduced social stigma) of viral suppression.
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Fármacos Anti-HIV/uso terapêutico , Infecções por HIV/tratamento farmacológico , Homossexualidade Masculina/psicologia , Carga Viral/efeitos dos fármacos , Adolescente , Adulto , Idoso , Idoso de 80 Anos ou mais , Feminino , Infecções por HIV/prevenção & controle , Infecções por HIV/psicologia , Infecções por HIV/transmissão , Humanos , Masculino , Pessoa de Meia-Idade , Estigma Social , Adulto JovemRESUMO
Stigma against sexual and gender minorities is a major driver of health disparities. Psychological and behavioral interventions that do not address the stigma experienced by sexual and gender minorities may be less efficacious. We conducted a systematic review of existing psychological and behavioral health interventions for sexual and gender minorities to investigate how interventions target sexual and gender minority stigma and consider how stigma could affect intervention efficacy. Preferred reporting items for systematic reviews and meta-analyses (PRISMA) guidelines were followed. Eligible studies were peer reviewed and published in English between January 2003 and July 2019 and reported empirical results of behavioral or psychological interventions implemented among sexual and gender minorities. All interventions addressed stigma. We identified 37 eligible interventions. Most interventions targeted sexual minority men. Interventions were frequently developed or adapted for implementation among sexual and gender minorities and addressed multiple levels and types of stigma. Interventions most frequently targeted proximal stressors, including internalized and anticipated stigma. HIV and mental health were the most commonly targeted health outcomes. A limited number of studies investigated the moderating or mediating effects of stigma on intervention efficacy. The application of an intersectional framework was frequently absent and rarely amounted to addressing sources of stigma beyond sexual and gender minority identities. A growing number of interventions address sexual and gender minority stigma in an effort to prevent deleterious health effects. Future research is needed to assess whether stigma modifies the effectiveness of existing psychological and behavioral interventions among sexual and gender minorities. Further, the application of intersectional frameworks is needed to more comprehensively intervene on multiple, intersecting sources of stigma faced by the diverse sexual and gender minority community.
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Minorias Sexuais e de Gênero/psicologia , Estigma Social , Estereotipagem , Medicina do Comportamento/métodos , Medicina do Comportamento/tendências , Identidade de Gênero , HumanosRESUMO
RATIONALE: Although Black gay, bisexual, and other sexual minority men face disproportionately high levels of incarceration and police discrimination, little research examines how these stressors may drive HIV and psychological health inequities among these men. OBJECTIVE: In this study we examined associations between incarceration history, police and law enforcement discrimination, and recent arrest with sexual HIV risk, Pre-Exposure Prophylaxis (PrEP) willingness, and psychological distress among Black sexual minority men. METHOD: Participants were a U.S. national sample of 1172 Black sexual minority men who responded in 2017-2018 to self-report measures of incarceration history, past year police and law enforcement discrimination, recent arrests, sexual HIV risk, PrEP willingness, and psychological distress. We used structural equation modeling to examine direct and indirect pathways from incarceration, police and law enforcement discrimination, and arrests to sexual HIV risk, PrEP willingness, and psychological distress. RESULTS: Past-year police and law enforcement discrimination prevalence was 43%. Incarceration history was positively associated with later police and law enforcement discrimination, which, in turn, was positively associated with recent arrest. Incarceration and recent arrest and were associated with greater sexual HIV risk; incarceration and police and law enforcement discrimination were associated with lower PrEP willingness; and police and law enforcement discrimination was associated with higher psychological distress. Mediation analyses showed that the effects of incarceration were partially mediated by police and law enforcement discrimination. CONCLUSION: Findings suggest police discrimination may be a mechanism of mass incarceration and fundamental driver of health inequities among Black sexual minority men.
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Infecções por HIV , Profilaxia Pré-Exposição , Minorias Sexuais e de Gênero , Negro ou Afro-Americano , Infecções por HIV/epidemiologia , Homossexualidade Masculina , Humanos , Masculino , PolíciaRESUMO
OBJECTIVE: This study examined psychological and sexual health indicators associated with positive feelings and discrimination at the intersection of race and gender among Black gay, bisexual, and other sexual minority men (SMM). METHOD: Participants were a national sample of 1,064 Black SMM (Mdn age = 28) who responded to self-report measures of positive feelings and discrimination associated with being a Black man, psychological distress, self-efficacy, emotional awareness, and sexual HIV risk and protective behavior. Using structural equation modeling, we examined associations between the positive feelings and discrimination scales and the psychological and sexual health indicators. We also tested age as a moderator of these associations. RESULTS: Our results indicated that positive feelings about being a Black man were significantly positively associated with self-efficacy (b = 0.33), emotional awareness (b = 0.16), and sexual protective behavior (b = 0.93) and negatively associated with psychological distress (b = -0.26) and sexual risk behavior (b = -0.93). Except for emotional awareness and sexual protective behavior, discrimination as a Black man was also associated with these variables, though to a lesser magnitude for positive health indicators. Moderation results showed that, except for the association between positive feelings and emotional awareness, younger men generally had stronger associations between health indicators and the positive feelings and discrimination scales. CONCLUSIONS: These results suggest that positive feelings, in addition to discrimination, at the intersection of race and gender play an important role in the psychological and sexual health of Black SMM, especially earlier in their lives. (PsycINFO Database Record (c) 2020 APA, all rights reserved).
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Negro ou Afro-Americano/psicologia , Minorias Sexuais e de Gênero/psicologia , Discriminação Social/psicologia , Adulto , Emoções , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Assunção de Riscos , Comportamento Sexual/psicologiaRESUMO
Transgender women are disproportionately affected by HIV and experience high rates of depression and anxiety. The importance of secure attachment in buffering against negative sexual and mental health outcomes is well established. However, few studies have examined attachment among transgender women. We recruited a community-based convenience sample of 213 transgender women in New York City (Mage =34.3; SD = 11.7). The majority were women of color (75.6%), almost half identified as heterosexual (47.4%), and 34.7% were HIV-positive. Preliminary analyses examined the sample distribution across attachment categories using the Revised Experiences in Close Relationships scale. Specifically, Brennan, Clark and Shaver's guidelines were used for categorization (43.19% fearful, 22.5% preoccupied, 21.6% dismissive, and 12.7% secure). Regression analyses examined the association of dimensional attachment anxiety, attachment avoidance, and their interaction with depression, anxiety, self-efficacy for condom use, temptations for condomless sex, and condomless sex acts. Results indicated a positive association between attachment anxiety and depression, anxiety, temptations and probability for condomless sex; and also between attachment avoidance and condomless sex probability. A significant interaction indicated that individuals with low attachment anxiety and attachment avoidance (i.e., secure) had the greatest condom use self-efficacy and the lowest probability of engaging in condomless sex.
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Apego ao Objeto , Satisfação Pessoal , Comportamento Sexual/psicologia , Parceiros Sexuais/psicologia , Pessoas Transgênero/psicologia , Adulto , Feminino , Humanos , Pessoa de Meia-Idade , Cidade de Nova Iorque , Adulto JovemRESUMO
OBJECTIVE: Examining sexual identity development-the process through which sexual minorities discover and disclose their sexual orientations-within a minority stress framework may help to contextualize sexual and mental health disparities among gay and bisexual men. Research on sexual identity development has typically focused on ages of achieving specific milestones (i.e., awareness, identification, sexual experience, and disclosure), though differences in onset and speed of the process and impact of these trajectories on healthy functioning in adulthood are understudied. METHOD: We analyzed cross-sectional data from 374 highly sexually active gay and bisexual men in NYC. Using latent growth curve modelling, we examined trajectories of sexual identity development through the four primary milestones. We next examined their associations with childhood and background characteristics, adult experiences of sexual minority stress, and adult mental health. RESULTS: Gay sexual identity and greater childhood gender nonconformity were associated with earlier reported onset of sexual identity development and younger age was significantly associated with faster progression through the developmental process. The model showed that faster progression through sexual identity development was associated with higher levels of sexual orientation-based discrimination, emotion dysregulation, sexual compulsivity, and anxiety and depression in adulthood. CONCLUSIONS: These findings support the need for a comprehensive and developmentally-informed model of adulthood functioning among gay and bisexual men that considers trajectories of sexual identity development-including onset and duration-as potential precursors to mental health difficulties in adulthood. Given the early onset of sexual identity development and potential lifelong sequelae, early prevention programs promoting positive sexual identity development are warranted.
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Purpose: Transgender women in the United States face elevated rates of HIV and of substance use. Studies measuring overall or aggregate levels of substance use have linked use to increased HIV transmission risk behavior (TRB). Although intensive longitudinal studies in other populations have found day-level links between substance use and TRB, no study has yet explored such links among transgender women. This study aimed to fill this gap in the literature. Methods: Utilizing survey and 60-day timeline follow-back interview data from a sample of 214 transgender women in New York City, we tested whether day-level heavy drinking, marijuana use, and/or nonprescription stimulant use were associated with odds of engaging in any sex (vs. no sexual activity) or engaging in TRB (vs. sex without TRB), adjusting for overall levels of use. Results: Multilevel models showed that each of the three substance types was associated with greater odds of engaging in sex on a given day-and more strongly so for heavy drinking among those with higher rates of heavy drinking, and for stimulant use among those with lower rates of stimulant use. Only marijuana use was associated with greater odds of TRB on a given day, but only among those with higher rates of use. Conclusion: These findings substantiate day-level links between substance use and engaging in sexual activity among transgender women, and importantly, between marijuana use and greater likelihood of TRB on a day when sexual activity occurs. This highlights the importance of addressing substance use for sexual health among transgender women especially focusing on marijuana use.