That's sort of proving my point though. You said yourself that's a great reason to stay off them. To me if you're constantly seeking darker and darker thrills lines become a hell of a lot more blurred and you get desensitised to what you're seeing to the point you need harder content.

What starts off as liking girls in their 20s getting face fucked becomes slightly younger looking forced blowjobs, becomes teens crying as they are being choked with dicks/vomitting/becomes even younger again.....its a fucking slippery slope looking for violent /extreme stuff. If you go looking i'd argue that eventually you're going to stumble on child porn/actual rape/torture and eventually if you've seen enough shit to become desensitised to normal stuff i'd argue that you could get turned on by it.