A guy walks up to a girl and asks her:
Guy: "Hey, I wonder, would you sleep with me for, say, a million dollars?"
Girl: "Hmmm, when I think about it, yes, I think I would."
Guy: "Would you do it for 50 bucks?"
Girl: "No, who the hell do you think I am!?!?!?"
Guy: "My dear, we've already established that, now we're just negotiating."
It's like that with 99% of girls, if not all.