One of the most important principles at work in the lifestyle of a guy who lays a lot of chicks is the Cialdini Consistency Principle:

When a woman is trying to make sense of what she did after the fact, she tends to backward rationalize her actions as representing her true desires based on her fundamental values.

In other words, a girl will tend to always conclude that her actions were consistent with her true feelings and values, and she will try very hard to avoid believing that she acted against her true desires or basic values.

If she sees herfelf as a girl who never has sex with guys unless she is in love with them, and you meet her and get her so horny that she fucks you in the heat of passion on the same day, she is going to go home and rationalize that, “I can't believe I did it with him! But...I am not a slut! So...…aha! Yes, it could only be that I am in love with him...”

They will actually convince themselves that they like you more, even if they say that they wouldn’t like a guy who pushed for sex too fast (of course, you didn’t “push” at all, not in the sense of forcing or pressuring her).

By the way, the more adverse the circumstances when you had sex, the stronger this principle works. If you fuck her in an alleyway somehow - something she would normally NEVER do - she will have to rationalize "I must be in love with him...I must be REALLY in love with him!!"

So whether you want a one-night-stand, a sex friend, a girlfriend, or a wife, your first goal is the same: lay girls A.S.A.P.!