Brief Report

Abstract

Abstract Much prior research acknowledges that peers influence adolescents’ sexual behaviors. Yet few studies have explored whether and how peers influence sexual decision making among emerging adults, especially among those in committed intimate partnerships, while also accounting for dynamics specific to the intimate relationship and respondents’ sociodemographic characteristics. Drawing on longitudinal data from the Toledo Adolescent Relationships Study, this report examined multiple aspects of peer influence on three different sexual behaviors among emerging adults: sexual non-exclusivity, number of casual sex partners, and lifetime number of sex partners. It was found that having more sexually liberal peers and peers who engaged in criminal activity significantly influenced emerging adults’ self-reported numbers of casual and lifetime sex partners, as well as the frequency of engagement in sexually non-exclusive behaviors among those in committed dating, cohabiting, and marital partnerships. This report discusses potential theoretical mechanisms linking these relationships and provides suggestions for future research.