Draxz said:
Everything you've said is technically true, but you're looking at it in completely the wrong way.
First things first. Under UK law, in order to be raped:
A) A person has to have been penetrated
by a penis.
B) The accused must have reasonable belief that the person in question did not consent.
It is impossible, under this definition, for a female-bodied person to commit rape. They can commit a functionally identical crime called "assault by penetration", but only if they insert an object into someone's body.
That said, men and boys can be raped under UK law. There's a very sad case right now in Manchester of a boy who suffered just that. It is exactly the same offence regardless of the sex of the victim. If a man over 16 has sex with a boy under 13, he is as guilty of "raping a minor" as the man who has sex with a girl under 13 (and assuming, quite arbitrarily, that both definitions of "having sex" involve the man in question penetrating the child's body with his penis). Again, it's the same crime because it's the same act.
If a woman forcibly envelops a man's penis with her vagina, the crime is called "causing a person to engage in sexual activity without consent", which is a much broader crime and while still a serious crime with a heavy maximum prison sentence, is not the same thing as an attack which penetrates someone's body.
Now, it's easy, if you're used to imagining that rape is somehow based on a nebulous category of "sexual intercourse", to decry this as sexist. But here's the problem, sexual intercourse is practically impossible to define. What one person classes as "sexual intercourse", another person may not. This is why we base the definition on the actual act which occurred, not on whether or not it was "sexual intercourse", but on whether there was penetration. You will find this is pretty much the same the world over. Contrary to popular opinion, rape has nothing to do with "having sex" with someone, it is about penetration.
And to repeat the same line I repeat every time this comes up, if you don't see the difference between envelopment and penetration, just try penetration. It is a very different experience which is hugely more dangerous, more painful and which, generally speaking, is likely to be considerably more humiliating and (because we have made the requirement that it be a penis) may result in further problems like pregnancy or put the victim at a heightened risk of STD transmission.
I'm not saying there are no problems with this, but I am saying that it is nothing to do with discrimination based on gender. It is discrimination based on the type of act which actually occurs, and that's a perfectly acceptable principle. If I punch someone in the face, I wouldn't expect to be charged with the same crime as someone who stabbed someone in the neck because we both technically "assaulted" someone.