It sounds like you don't know too many young women ...
... if you did, you'd know they need sex as much as any guy ... some of them need a lot more sex than some guys ...
Forget the money, agreeing to have sex with her, then refusing, would be a pretty strange thing to do - equivalent to a girl cock-blocking you, by taking you home then not doing anything
They look the way they look - to men - for a reason: evolution made men respond most strongly to the fittest girls when they're at their most receptive. It's a complete package, looks, body-language, verbal and non-verbal attitude
so if you don't like the young cuties, no problem: move over!! I take the view if it's not me that's doing her, it would be some other guy, WG or not, and I bless the Gods that put her in my path