We examined whether sexual attitudes of adolescents were related to their self-reported sexual risk behavior by analyzing survey data from 1,052 boys and girls aged 14 to 17 years from a low income, urban community. Sexual behavior norms that may increase sexually transmitted infection/HIV risks in youth were sanctioned more by males and by sexually experienced youth, but their attitudes were unassociated with either their age or race/ethnicity. Endorsement was correlated with greater intention to have sexual intercourse among all youth. Among sexually experienced participants, it was associated with earlier sexual debut, more partners, and less intention to use condoms but not with the number of unprotected sexual episodes in the prior six months. Sexual attitudes of youth may conflict with initiation and maintenance of safer sex practices, making them vulnerable to HIV and other sexually transmitted infections. Risk reduction interventions for adolescents should address this.