Depends, for a night of screwing around, or actually going out? How long can it last(ie, does it matter if we snuggle for half the night, or just pure unadulterated sex). Are there any repercussions?
Anyways: My Friend, because I've had a crush on her for far too long, and even if it doesn't work out, it'd be nice to get it out of the way. [Hopefully it wouldn't impact on our relationship though, as she's my second best friend].
Or a celeb pick:
Katy Perry, she seems happy and fun, she's really pretty (most important thing to me when it comes to the body), and also has a great body.