If you were cloned, would you have sex with yourself?

I've got an account over at Ok Cupid (just for the tests, promise!) and every so often they email "matches" of girls they think you might be interested in or compatible with.
What is it with these girls who think they're all that? If you've ever browsed profiles at a dating site you'll know what I'm talking about. Do they get too much attention from drunk guys at bars and come to the conclusion that they must be incredibly attractive? It's quite interesting, I really wonder how one could develop a huge over-inflated ego. I mean, some people fucking *love* themselves! Really, if you're so much better than anyone else then WTF are you doing on a dating site for god's sake. Maybe it's just me, but I find people like that totally un-approachable.