he's not making a rape joke, he's referring to the fact that prisoners tend to treat convicted rapists poorly, on top of the fact that he's a cop, that means he will not be treated well and probably will get mercilessly beaten by his fellow inmates on a daily basis.. he's not saying he'll get punished with rape, he will be punished in some other way by other inmates for being convicted of rape Sexual abusers of any type usually get their asses beat in jail and this is a known fact