Wow. You have issues of some kind, BackUp. o.O I mean, why would you want to do that to someone? You feel it's up to you to "teach them a lesson"?
I agree with the first part of your post though - if a guy likes you, he likes you even if you sleep with him on the first date. Although it is true that some men label women who have sex on the first date as "too easy" or something along those lines. But you wouldn't want a guy who does that, anyway :-).