Sorority women and fraternity men are more likely than other students to be survivors and perpetrators of sexual assault, respectively. The present study examined sorority and fraternity members' rape myth acceptance, bystander efficacy, and bystander willingness to help in potential sexual assault situations. Sorority women were more rejecting of rape myths and were more willing to intervene than fraternity men. However, no difference in bystander efficacy was found. Implications of this contrast are discussed. (Contains 1 table.)