Word. This is as it should be.
Something doesn't sit right with me about the idea of going to bed with a chick who probably wouldn't be down for it if she had her wits about her. Legal or not, it just seems wrong to me on a few levels.
And there's really no reason to. Getting laid is easy enough for anyone who isn't deformed, obese, or just a herb of the highest order, and it'll probably be a lot more fun than with someone who is so hammered she can barely stay lucid.
Not to mention that as soon as you walk out the door with someone who is noticeably beyond the point of good judgement, unless you are stumbling and slurring every bit as badly yourself, you just got marked by everyone there who had their eye on you that night.

