>the U.S. states in which rapes rose by 53 percent had the least Internet access between 1980 and 2000—and so the least access to Internet porn. States with the most access saw a 27 percent drop in reported rapes.
But there are so many other factors playing into this (with heightened exposure to Internet due to higher income and more free time also comes a higher level of education, which may deter rape), so the debate is still going on, but a clear "porn -> rape" correlation doesn't seem to exist.