In theory, no.
In practise, rape is something the majority of people would just be better off staying away from because it's a subject you better know how to handle well if you joke about it.
(And the majority of rape jokes tend to be on the victim anyway, and that just makes you an asshole.)
And context matters.
There are jokes I will tell in a company of people who know that I'd not tell on the Internet for example.
People who know me understand the context and for example that I'm expressing frustration with an actual problem I have, instead of making fun of a another group of people.
nightmare_gorilla said:
No. period, there should never be anything you're not allowed to joke about. it's a damn joke by it's very nature it's not meant to be taken seriously.
Even still, what you consider 'humorous' carries all kinds of implications.
If for example your joke's punchline is 'he's gay', then the implication is that you think simply being gay is worthy of ridicule.
Also humor is a strong social bonding mechanism.
"We're all finding these things funny, we're bonding."
"We are collectively feeling superiour against this other group of people."
Etc.
BathorysGraveland2 said:
So yeah, time and place I guess, though personally I've never been offended by any joke.
I have been made angry and uncomfortable by jokes, certainly. And unsafe, even.
Because a joke can very strongly send out the message of 'We as a group do not consider someone like you an equal.'