It’s said a lot that if she hasn’t banged you three dates in, she never will. That’s patently false. One can be attracted to someone without banging them immediately. It’s like the three month rule, it’s arbitrary and isn’t reflective of reality.

People will bang when they feel comfortable and want to bang. That’s not a bad thing, in fact, who wants to fuck someone who doesn’t want the sex? Sexual compatibility is important but it doesn’t need to be figured out ASAP. If you’re that hard up, get an FWB. But really masturbation should be sufficient.