Is the thesis of this article
http://www.mrcranky.com/movies/igbygoesdown/8/1.html
McKenzie-Mohr and Zanna found that after exposure to non- violent pornography, the masculine sex-typed males "treated our female experimenter who was interacting with them in a professional setting, in a manner that was both cognitively and behaviorally sexist" (1990, p. 305)
However, a differing scool of thought is:
Banning porn may INCREASE rape
http://www.zetetics.com/mac/isil.htm
Thesis: "To further repress sex by restricting pornography might well increase the incidence of rape. "