I have very mixed feelings on this one. Yes, they were both drunk, but being drunk is not a defence in law. If you punch someone when drunk you are treated exactly the same as if you'd been sober. Also, Amy said no. There is no doubt about that for us as viewers (as there would be in most rape situations, whether drink is involved or not). Having sex with someone who not only is too drunk to consent but has explicitly not consented is rape.
I feel a tiny bit sorry for Aaron, as I don't think he set out to rape Amy, and he probably wouldn't have done what he did when sober; but I really don't like the message that men are at the mercy of their hormones and 'can't control themselves', that puts all the responsibility onto women.
Drunk or sober (and he was sober enough to have sex) he knew that Amy had said no, but did it anyway. That's why I'm not keen on this storyline. If they want to cover date rape I think they should have been a lot clearer about guilt or innocence. The scales are already weighted against women in these situations, and too many people are convinced that they 'were asking for it'. Whatever happens in this story, I worry that it will feed into that way of thinking.