KalCyan said:
For Sex, I have tried writing this a few times but this is pretty much the answer. If you are sober and the other person is not capable of reasonable decisions, you are forcing sex on them. This is not a matter of fucking personal responsibility of the impaired person to not get drunk. This is someone who is both mentally and physically capable taking control of someone who is neither of these things. We can argue and debate about specifics and line drawing but it isn't that damn hard. If you are pushing stuff to happen every step of the way, if they are no longer able to articulate, if they aren't able to think probably. You Are Raping Them.
This is pretty much spot-on.
Having sex while drunk is fine as long as consent is given. You might regret it but everyone regrets things they do when they're hammered.
Having sex while paralytic/passed out though... that requires at least one of the people involved to be sober enough to know what they're doing, and they
should know that if someone is barely able to stand or even speak, they just cannot consent.
I don't even think that every person that has sex with someone in this condition is necessarily being malicious. In their minds, they see someone mumbling "whatever" when they're on the floor desperately wanting to go to bed as some sort of meaningful consent.
I think the best thing to do is encourage sex ed classes to teach what consent is. Maybe indicate that there's a bit more nuance than "yes means yes", though that's usually reserved for people who are already well-acquainted with each other.