Fantasizing about real, actual people makes me feel very awkward and uncomfortable. There's a few actors I think are very good-looking (Johnny Depp, anyone?), but I can't think about them sexually without feeling like I'm being extremely impolite. And I don't start to feel any real
attraction until I'm friends with someone, anyway. I need the emotional connection in order to lust after someone (though fictional characters, either my own or someone else's, can sometimes be a different story).