Findings suggest that PHIV youth were less likely to be sexually active. Peer norms exert an important influence on prenatally infected and perinatally exposed youths' sexual behaviors; the role of peer norms was more salient for girls than boys. Youths who reported that a greater number of their peers believed that sexually-active boys were popular and were more likely to report engaging in any sexual behavior, even after accounting for HIV status and sociodemographic characteristics. Gender moderated this relationship, with girls more likely to report engaging in oral sex based upon peer approval. The study found that the sample of PHIV may avoid penetrative sexual activity through delaying sexual onset or by engaging in more touching behavior as harm reduction strategies. Data was collected from the baseline interview of a longitudinal study on risk and resilience with PHIV youth, Project CASAH. Using logistic regression, the study tested the association between sexual behavior and HIV status, demographic characteristics, and peer influence regarding sexual behavior. Tables, figures, and references