Ya, I suppose that if you go in the back door it still counts as rape.
The point that you guys keep sticking your heads in the sand about is both could be blackout drunk. That makes it mutual rape.
You are assuming there is no force or coercion involved. Drunk people, including people who are black out drunk are capable of being violent, and of attempting to force another person to do all sorts of things. Depending on a lot of factors, they may be successful. A very large person who is very drunk may still have the capacity to force him or herself upon a sober person who is very small. Or sleeping. Or frightened. Such a drunk person would be guilty of sexual assault, and of rape, if successful.
You are assuming that everybody is talking about two college kids who get drunk at a party and bang each other. While plenty of that happens at parties and bars and elsewhere, so does the circumstance where someone will specifically try to get someone else drunk or stoned or otherwise incapacitated so that they cannot make an effective defense.
And then, there's the circumstance where someone gets a bit hammered and decides that the object of their erection is mutually attracted and interested and tries to force the situation.
You also always seem to believe that if one person is under the influence of drugs or alcohol, and the other person has also been indulging that they must both experience the same degree of incapacity. That is not true. Weight, experience drinking and gender and possibly genetics all affect how alcohol will affect an individual.
I've never yet seen a woman attempt to sexually assault a man, or a drunk or otherwise incapacitated man. I am sure it happens. I haven't seen it. I have seen men attempt to sexually assault women. Multiple times. In some cases, the man was drunk and the woman was as well. In some cases, the man was drunk and the woman was not observably drunk. In a couple of cases, everybody was stone cold sober. But most common was the circumstance where the woman was pretty to extremely drunk.
Things I have seen drunk guys do: Completely misunderstand whether or not a woman was interested in him in any way, shape or form. Also observed of sober guys. Attempt to force their attentions on uninterested women. Attempt to follow women who excuse themselves to get away from their attentions. Tell everybody how much she wants him/it/him to give it to her. What a bitch/lesbo/cunt she is for not being willing to (whatever sex act he can call to mind at the moment) and how she is just a tease.
Things I have seen women do, drunk or sober: Politely decline attention, drinks, conversation, having attended the same school or been in the same calc class. Politely attempt to de-escalate the irritation and attention from some guy who wouldn't take the more polite and subtle hint the first 1 to 12 times. Leave the room/party to escape the guy who won't take no for an answer. Deck the guy who refused to take no for an answer.
I am certain that women also behave very badly when drunk or under the influence of whatever. Or without being under the influence. I am certain that women sometimes rape men. I know they sometimes rape boys. And girls and other women.
But every single study I've ever read shows that men are far more likely to commit all forms of sexual assault than are women. Drunk/sober/ man/woman, man/man, man/child.
I'd love to read some thoughtful work about how to stop men from sexually assaulting anyone. Also to stop women from doing the same, but the fact is, men seem to be the main perpetrators. By far.
Instead of looking at what causes men to do this, I see a lot of men trying to blame women. Which goes a long way towards explaining why there are so many sexual assaults.