The enforcement is double underlined and bolded there. No it is not enforced.
It's not in the law either. You're fully responsible of the decisions you take while drunk. And contract you sign while drunk may be enforcable including commerical contracts.
You're flatly, factually wrong. The only case considered is when peoples are incapacitated. Or near incapacitated.
You are responsible in the fact that you made those decisions. That is not the issue here. The issue is that you guys seem to be saying 'if someone gets drunk, and then gets pressured into having sex or someone takes advantage of their drunken state so that they have sex with them, that shouldn't be considered rape because "they should have known what they were getting into"'. Which is the same logic as 'if someone walks home from a club at night, and is wearing revealing clothing, and someone forces themselves on them, that shouldn't be considered rape because "they should have known what would happen"'. You are minimizing rape by saying it can't happen because it's the victims fault. That's called victim-blaming. It happens way too much already. Also, the fact that
you don't get to decide whether they're just feeling 'regret' or were actually raped. You don't know if someone did slip something into their drink, or the emotional trauma that can be caused even just from not knowing what happened and waking up alone, naked, with the room smelling like sex. If someone drugs them, and someone else who is unaware that they were so drugged, takes advantage of their drugged state, that is rape.
Rape is, in the end, for prosecution purposes, a matter of intent. It is not moral to convict someone who wasn't taking advantage of someone, or honestly didn't realize they were. However, the cases in which they weren't are vastly outnumbered by the times they were; thinking 'she's drunk; maybe I'll get lucky' is an example of the first steps on that course to taking advantage of them. That's the sort of thing
I've been trying to talk about.
However, I also don't think two people can mutually rape each other. Rape involves sex without the consent of the other party. If they are trying to have sex with you while you are trying to have sex with them, that is pretty clear consent as far as I can tell(and yes, normal sex can become rape; consent can be taken back).
Rape for people who have been traumatized and need counseling and the like is not a matter of intent, it's a matter of perception. Because whether they were trying to or not, you perceived getting raped, and that is the part that leaves scars. You don't get to tell someone 'you were not raped'. Just like you don't get to tell someone 'you belong to me'(leave aside bdsm for the moment, please?) or 'you could get over your mental issues if you just tried harder'. Or 'you can stop being gay if you want to'. That's not how it works. You can ask them if and why they want to press charges, and get their view on things. You cannot solely use their view, since there are cases in which people fake being raped (and in all honesty, those people disgust me almost as much as rapists; more, in most cases) to get what they want/revenge or the like. However, you certainly cannot use only the accused rapist's view.
That, plus the really fucked up shit with what happens if one of them gets pregnant and laws concerning that.
At heart, it's a simple issue. Dealing with it is not a simple issue, however, and trying to do strawman claims with the way the law should work is ridiculous. It's always going to be a case-by-case basis.
Having sex with someone while they are drunk is not necessarily rape.
Having sex with someone who didn't actually want to for XYZ reason, is rape, however.
Trying to protect people from being accused of rape, and by extension, rapists, is just as bad as trying to attack people who falsely accuse of rape, and by extension, actual rape victims. You can't claim 'it will always be their responsibility to avoid being raped while drunk'. You can, however, claim that it will always be your own responsibility to avoiding raping someone while they are drunk. Or while you are. Or at all. Just don't fuck people if they don't want you to fuck them. Really pretty simple, at heart.