Background : Normative perceptions are strongly related to risk behaviors among emerging adults but the role of gender-specific normative perceptions remain unclear. Objectives : The current study examined the differential effects of same-gender and gender-neutral normative perceptions on self-reported substance use and sexual risk behavior. College students (n = 389, ages 18-25) reported binge drinking, cannabis use and prescription drug misuse, sexual risk behavior, and the perceived frequency of these behaviors by both the average- and same-gender adult. Results : Binge drinking was positively associated with same-gender norms only, whereas cannabis use and sexual risk behavior were also positively associated with gender-neutral norms perceptions. For binge drinking only, same-gender norms explained more variance in behavior than gender-neutral norms. Conclusions : Findings indicate perceptions of same-gender norms play a particularly important role in binge drinking during this developmental period. Interventions targeting emerging adult risk behavior should include within-group normative perceptions related to demographic and social group characteristics.