Sinclair, R. C., Lee, T., & Johnson, T. E. (1995). The effect of social-comparison feedback on aggressive responses to erotic and aggressive films. Journal of Applied Social Psychology, 25 (9), 818-837.

Abstract:  Assessed the impact of social-comparison (SCM) cues and filmed violence on aggression toward women. 70 undergraduate males viewed either erotic, violent sexual, or violent nonsexual films. A male confederate provided SCM feedback by indicating (or not indicating) that the film degraded women. Self-reports of sexual arousal, affective responses to the films, perceptions of violence, perceptions of pornography, and perceptions of portrayal of women were measured. In a purportedly unrelated learning experiment, Ss were given the opportunity to aggress toward a female confederate through electric shock; intensity and duration were measured. SCM information caused reductions in self-reports of sexual arousal, affect, and increased perceptions of violence in the erotic film condition only. SCM information led to reduced shock in all film conditions. (PsycINFO Database Record (c) 2004 APA, all rights reserved)