Eh, saw this in another thread not long ago (but it was another dude railing against it). But you couldn't have known that (I think it went by a strange title) so on with the show!
I think most of the ladies handled it pretty well, mentioning the gender difference. And I think they summed it up pretty nicely: No, it wouldn't be as funny if it was a guy wrecking a girl, and it probably does have something to do with the nature of the organ. The penis is inherently a more comical sexual organ than the vagina. It has a simple, definite shape, it's external, and it has motion. There's a reason comedians talk about penises a hell of a lot more than vaginas. They're just funny. Though I do wonder about that one lady who never fully admitted if she thinks the woman was in the wrong for doing that.
Breasts are sort of funny too, but violent behavior toward women is inherently less funny than violent behavior toward men. That is because of society, though. We're used to seeing men getting banged around all the time--barfights, westerns, ring fights, and all of those other manly tropes. But women? Oh, they're so defenseless! They're kind! They're gentle! They only act when provoked! Or at least that's what society has told us for the last few thousand years.
Call it what you want: sexism, reverse-sexism, bad TV. It's really no different than the whole "It's only racist when white people do it." thing. It all comes down to societal norms and stereotypes. And the only reason it's a problem now is because we think we are above those lines of thinking, which used to be "right" but we now call ignorant, hateful, and bigoted. But the fact of the matter is we aren't as far from these problems as we like to think we are. We think we've mastered those problems so well, to touch on similar problems would only disrupt the tenuous balance we've established. And because of that, nobody wants to break the ice and say that black-only scholarships aren't right, or that sexual harassment towards men is a serious matter that needs discussing.
So my solution? Get rid of all of those groups that support women's rights, men's rights, minority rights, and gay rights. And in their place, establish a group for HUMAN rights. Everybody has problems. Everybody gets looked down on sometimes for what they are. And to treat them separately is only treating the symptoms, not the cause. And the cause is closed-mindedness. We need ONE authority on equality, because in the end we want equality to be ONE thing across the board.
