If alcohol were illegal and statistics showed that alcohol led to rape, I would expect the legalization of alcohol to lead to more rapes. What other topic would you like to switch to? Drugs? Tobacco? Fatty foods? Same answer.
But the decision to legalize alcohol would be made on many other factors rather than just its connection to rape.
Prohibit alcohol? No, we tried that once and it didn't work.
Do you think prohibiting porn would be any more effective? Especially considering that porn doesn't have to be smuggled over the border- it can simply be downloaded from a Swedish, Dutch or Russian company.
Perhaps we should take a lesson from that, then.