The Influence of Peers, Romantic Partners, and Families on Emerging Adults' Sexual Behavior.

Prior research acknowledges that families and peers influence adolescents' sexual behaviors. Far fewer studies have explored whether and how families and peers influence sexual behaviors among emerging adults, especially among those in committed intimate partnerships, while also accounting for dynamics specific to the intimate relationship and respondents' sociodemographic characteristics. Even less is known about whether and how previous romantic relationship experiences might influence emerging adults' future sexual behavior both within and outside the confines of committed intimate partnerships. Drawing on longitudinal data from the Toledo Adolescent Relationships Study, we examined how emerging adults' family backgrounds, peers' sexual attitudes and behaviors, and past and current relationship experiences influenced their engagement in casual sex and sexual non-exclusivity. We found that each of these contexts was significant predictors of emerging adults' casual sex, and that both peers and romantic relationship experiences significantly influenced the likelihood of engaging in sexually non-exclusive behaviors among those in committed dating, cohabiting, and marital partnerships. We discuss potential theoretical mechanisms linking these relationships and provide suggestions for future research.