Sexual assault is a bit strong imo.
Yea, maybe he over stepped the mark. Maybe.
I've been to these kind of parties, it's no secret what goes on at these uni house parties. They are easily avoidable (i.e. don't go) if you are not 'in to' the getting drunk, playing drinking games, passing out thing.
Now I am not saying she consented, far from it. But you have to be really naive to go to one of these and not know what might happen if you get drunk, pass out, etc. It's a uni party after all. House full of drunken, horny, young adults...
The guy though should know his audience. This is what a lot of things come down to. I know out of my mates who I can slap round the face with my todger (both guys and girls) and nothing will come of it. Apart from maybe retaliation when I pass out.
End of the day he was stupid. If it was any other scenario, guy doing it to a guy, girl smacking her melons around the place to either guy or a girl or even sitting on their faces, it would no where near have gone this far.
Also, I don't get the thing with recording everything. You hear anough bad things coming of someone recording something. People don't learn.
Bottom line is he was stupid, his mate shouldn't have recorded it, he should have know his audience better. She should have been mature enough to not drink herself to oblivion and put herself in a vulnerable position. He should have been punished, but 9 months in prison and on the register is ott.