Sexual behaviour in 15-year-old adolescents: insights into the role of family, peer, teacher, and classmate support.

OBJECTIVE: The aim was to investigate the role of different forms of social support in early sexual intercourse and contraceptive use. MATERIALS AND METHODS: The study sample included 18,918 15-year-olds who took part in the 2018 Italian Health Behaviour in School-aged Children study. Multivariable multilevel logistic regressions were performed taking into account geographical region and socioeconomic status. RESULTS: 21.7% of adolescents reported early sexual intercourse. 71.9% used a condom at last sexual intercourse, 12.2% oral contraceptives 41.2% other contraceptive methods (multiple response question). High support from family and from teachers were associated with a lower likelihood of early sexual intercourse in both genders, while peer support was shown to increase this likelihood among boys. Adolescents with high social support were more likely to use condoms. CONCLUSIONS: Social support can have a positive influence on adolescents' sexual behaviour. Sexual education programmes should aim to engage peers and those significant adults who can influence adolescents' lives, in and out of school.