They may get away with it with some parts of the audience. But I guarantee that the part that has actually BEEN raped wouldn't find the jokes funny.
I must say that if you're a rape victim, and you want to tell a joke about it, you've got every right. Just as Richard Pryor and other black comedians have made a fortune off of telling jokes on their own race.
However, the joke in Dow's thread below, and some others I've read recently are out of line particularly when their disguised as topical...like the one from Dow that MaryAnne posted the other day and then got all indignant because some of us took it seriously.