Why do (some) women sleep with one guy the day they meet , but waits until commitment with another?

So my post is inspired by this post.

I personally think that said post confirms the entire AF/BB theory discussed in theredpill and purplepilldebate forums and subreddits.

I think that , to answer the question in the first post - why do men get upset if a woman who's had a lot of casual sex withhold sex until commitment, we need to ask the opposite question.

So, women, why do you have crazy, wild sex with some guys without expecting anything in return, but with other guys you wait until you are commited? Please answer with actual logic. If there is no logic then please say so as well.