College men's exposure to pornography is nearly universal, with growing viewing rates nationwide. Substantial research documents the harmful effects of mainstream, sadomasochistic, and rape pornography on men's attitudes and behavior related to sexual assault. The present study surveyed 62% of the fraternity population at a Midwestern public university on their pornography viewing habits, bystander efficacy, and bystander willingness to help in potential rape situations. Results showed that men who view pornography are significantly less likely to intervene as a bystander, report an increased behavioral intent to rape, and are more likely to believe rape myths.