Why do people believe poop is going to be a deterrent? They're in prison. These people are professionals at hiding things up their bung hole. Poop will not matter to them. Resistance only means they'll make it worse. The only way for him to avoid it is to do something to make them think he's bat-sh!t crazy. First day in, pluck out someone's eyeball and chew on it. Disgusting? Absolutely, but no one will rape his bung hole after that.