It's not a good thing, we all know that. And it's not something that should be deemed laughable. But so is murder, theft, racial slurs and things of the like, but we make jokes about them all the time. In my opinion it's not something that's fit to be a joke about 95% of the time. Don't doubt it can be, I'm just not able to think of any way it can be in a normal discussion and wouldn't like it to be personally. Leave it to those that know what the hell they're talking about.
There's always an exception. Doesn't mean you should try to be that exception. So let's leave this conversation knowing rape is bad, don't think resorting to rape is good in any circumstance you can think of, and this is a topic that'll get you some negative social points if you started it. You know, common sense things.
"Cogito, ergo es eggo." A.K.A. "I think, therefore you are a waffle."