Depends on his personality. If he's not a super good-looking guy, but really sweet, I would go out with him. Personality/intelligence are far more important to me. Looks fade. If he had an ugly personality, what he looked like is of no importance. Ugly on the inside, means ugly on the outside.
And I only "hook up" with guys I'm in a committed relationship with. So if we're at that stage in the game, it's safe to say that I'm past caring about what you look like, and I find more important things worth noting.
BTW, I fail to see what any of this has to do with me thinking Paris Hilton is an ugly troll covered in STD sores. I'm never going to meet her, fuck her, talk to her or interact with her in any way. I'd be too scared of catching something.