“…Peer sexual behaviors Perception of more sexual intercourse, other risk behaviors, positive social gains and positive attitudes towards sex, associated with earlier age at first sex [65,75], increased ever had sex [64,65,[76][77][78][79]109], more unprotected sex [40,50,64,75], more sexual partners [65,75], and higher STD incidence [50,75] Positive social norms, associated with decreased ever had sex [81] and less unprotected sex [76] Normative beliefs favoring males, associated with more unprotected sex [40] Perceived barriers to condom use (partner motivation, sexual sensation, acquisitional barriers), associated with more unprotected sex [40,80] Related peer behaviors Increased delinquency and drug and alcohol use, associated with increased ever had sex [46,58,73,77], earlier age at first sex [58], more sexual partners [46], more unprotected sex [50,58], and higher STD incidence [39] Older peers drank alcohol, associated with increased ever had sex [77] Peer support, associated with later age at first intercourse, less sexual partners, and less unprotected sex [46] Family norms Mothers education (less than high school), associated with increased ever had sex [49,79] Adolescent perceives maternal disapproval of premarital sex, associated with decreased ever had sex [55] Consistency Self concept Negative health behaviors, associated with earlier age at first sex [60] B...…”