[gadders]

I've not seen any evidence either way, but I'm not sure you'd get an RCT of this past an ethics committee anywhere.

For now, I'm inclined to err on the side of caution and not enable perverts.

[harimau777]

Just because it's not possible to study something directly doesn't mean that we can't study it. We could compare statistics in countries with different laws. Or we could look at studies of how pornography consumption influences non-deviant sexual behavior.