I didn't say rape her on the dance floor.
I don't mean to come off rape-y, but there's nothing wrong with drunk hook ups. Generally, girls are in groups to watch over each other. They get dressed up and come to places like that for a number of reasons, but the chance of doing stuff with guys is one of the reasons. Girls can be shy like guys; they drink liquid courage too.
If they're not keen, they will say so; girls don't suddenly lose their standards after a couple of drinks. If they do, they're just using it as an excuse and are probably a horrible person.
There's a difference between forcing yourself on a girl and seducing her while her inhibitions are slightly relaxed.