College students perceive their risks for negative outcomes from sexual behavior as lower than that of their peers. We examined whether similar biases would occur when undergraduates rated their own, their close friends', and the typical college student's attitudes regarding casual sex and sexual responsibility. Participants rated their own attitudes relative to all others' as the least permissive and most sexually responsible. Close friends' attitudes were rated as less permissive and more responsible than the average college student's. Finally, individuals with unrestricted sociosexual orientations and men attributed more permissive and less sexually responsible attitudes to both themselves and close friends than did individuals with restricted sociosexual orientations and women. These latter effects were absent when rating the typical college student.