There seems to be some evidence to support your assumption. I saw something somewhere that claimed that the frequency of rape has actually fallen over the last

There seems to be some evidence to support your assumption. I saw something somewhere that claimed that the frequency of rape has actually fallen over the last 15 years and noted that that correlated with the expanding availability of Internet porn. That's weak evidence, but at least it doesn't contradict the hypothesis. Someone should try giving some pedophiles access to a generous supply of computer-generated CP and seeing what happens.