I don't flirt that much. If I like someone in that way I tell the person I'm interested. This doesn't always work out good though, since in most situations it's the thrill of the chase that turns both individuals on. I guess, you kind of have to play hard to get, to keep the other person interested. You should really check out the different pick up artist's way of flirting though. My favourite is gambler's stealth method. If you don't know what a pick up artist is, I suggesting reading The game by Neil Strauss. Great book, not only for the tips on how to flirt.