Having sex with a girl will cause her to have a short term attachment to you, but in the long term they will lose interest and move on once sex has happened and the chase is over. So if what I'm going for is a long term relationship, should I escalate to sex on the first date, or make her wait for it? I'm not losing anything either way, but her type is very promiscuous so I fear she will branch swing quickly if I move too fast.