"(porn is just wholesale prostitution)"
Porn is a form of prostitution. What is the moral difference from paying someone to have sex with you and paying two other people to have sex with each other while you watch?
If a man would not hire a prostitute, then he should also not look at porn. Not much of a difference.
Bingo. If you're not going to hit someone, then you'd better not watch boxing. Or a crime movie. Or a movie about how Jesus was crucified...since if you're not going to crucify someone, you shouldn't look at it.
</sarc>