Having sex with someone without their consent is rape, but that doesn't automatically mean it's a bad thing. A woman raping, in terms of actual consequences, isn't the same thing as a man raping. If a woman "raped" me, didn't get pregnant by it, didn't give me any skanky diseases, and didn't publicly accuse me of being the rapist, then I'd probably enjoy it. At worst, it might be a slight inconvenience for me.
Everybody knows this on an instinctive level, which is why we let them away with it. (Well, there's also an innate disposition against hitting any women or children, which might be why we let them away with it even when they do do something wrong.)
I'd say the _real_ female equivalent of raping someone, in terms of harm to the opposite sex, would be... getting pregnant on purpose so that you can get married or some bullshit.