There has been a growing body of research on best approaches to reduce college men's sexual assault perpetration. While some interventions have successfully decreased perpetrator behavior, very few have accounted for college men's pre-intervention likelihood of offending (i.e., risk status). Considering the difficulties in changing high-risk men's sexual behavior, new prevention strategies are needed. The current study implemented an experimental manipulation informed by Deviance Regulation Theory (DRT), which postulates that people are strongly influenced by the potential consequences of deviating from group norms. Furthermore, our DRT-informed experimental manipulation tested whether sexual aggression could be reduced among men across different levels of perpetration risk. Men's risk status was operationalized by how much they perceived their peers to endorse norms that condone sexual assault (e.g., rape myth acceptance). 551 college men were recruited from an online crowdsourcing site and randomized to receive messages related to: a) positive characteristics of non-sexual aggressors, b) negative characteristics of sexual aggressors, or c) characteristics of homework completers (control condition). After they received one of these messages, participants interacted with a fictitious female participant to complete an online media task. During this task, they learned their partner had a strong dislike of sexually explicit media and were given the option to send up to 120 seconds worth of either a sexually explicit or nonsexual film clip. Sexually aggressive behavior was operationally defined as the duration that participants sent the sexual video. The main hypothesis was that there would be an interaction between message framing and peer norms condoning assault. Moreover, it was predicted that positively framed messages (compared to control) would reduce sexual aggression among men with stronger peer endorsement of these norms, while negatively framed messages (compared to control) would reduce sexual aggression among men with weaker peer endorsement of these norms. This hypothesis was not supported, as there was no interaction between message framing and peer norms condoning assault. However, there was a significant main effect of frame condition, such that across peer norm status, participants receiving positive messages demonstrated reductions in sexually aggressive behavior. Implications for sexual assault prevention programs are discussed, including the utility of strength-based approaches to promote prosocial behavior and deter college men from perpetration. [The dissertation citations contained here are published with the permission of ProQuest LLC. Further reproduction is prohibited without permission. Copies of dissertations may be obtained by Telephone (800) 1-800-521-0600. Web page: http://bibliotheek.ehb.be:2222/en-US/products/dissertations/individuals.shtml.]