This is a solid piece on exactly why rape jokes are never, ever funny
Shakesville: Feminism 101: Helpful Hints for Dudes, Part 3
Here is why I refuse to take rape jokes sitting down…
Because 6% of college-aged men, slightly over 1 in 20, will admit to raping someone in anonymous surveys, as long as the word "rape" isn't used in the description of the act—and that's the conservative estimate. Other sources double that number (pdf).
A lot of people accuse feminists of thinking that all men are rapists. That's not true. But do you know who think all men are rapists?
Rapists do.
They really do. In psychological study, the profiling, the studies, it comes out again and again.
Virtually all rapists genuinely believe that all men rape, and other men just keep it hushed up better. And more, these people who really are rapists are constantly reaffirmed in their belief about the rest of mankind being rapists like them by things like rape jokes, that dismiss and normalize the idea of rape.
If one in twenty guys (or more) is a real and true rapist, and you have any amount of social activity with other guys like yourself, then it is almost a statistical certainty that one time hanging out with friends and their friends, playing Halo with a bunch of guys online, in a WoW guild, in a pick-up game of basketball, at a bar, or elsewhere, you were talking to a rapist. Not your fault. You can't tell a rapist apart any better than anyone else can. It's not like they announce themselves.
But, here's the thing. It's very likely that in some of these interactions with these guys, at some point or another, someone told a rape joke. You, decent guy that you are, understood that they didn't mean it, and it was just a joke. And so you laughed.
. . .