It's a stereotype, it doesn't happen as much as the popular TV/Movies would lead you to believe.
I personally know someone in prison and he said that type of shit doesn't happen and everyone is cool with each other for the most part. Occasionally you get someone who thinks they're tough shit, but usually they get put in their place. Even when he was in Wayne County (jail in downtown Detroit) while awaiting trial, he said it wasn't bad.
It's no PARADISE, but it's not like they make it out to be in movies/tv.
But for the most part, if you're cool w/ them, they're cool with you.
My girlfriend knows someone in a pretty tough prison down in PA, and while that place can get rough, no one participates in the butt fucking.
Personally, if I was in prison, I would refrain from wiping after going numero dos. No one in their right mind would want to penetrate a layer of shit just for a few moments of fun
