I truly believe that it all goes back to basic instincts of all human beings: people want what they can't have.

Before a man sleeps with a woman he must first earn it. He must learn to love and care for her to a point where sleeping with her is like the most amazing thing that could ever happen to him. That is the only time he will value things and not 'pull away'. Otherwise, they will just take things for granted and possibly get distracted by a multitude of other things...(not necessarily other girls)...

haha..i'm not a man though...although i've seen it happen time and again. if a woman doesn't know how to seduce her man and make him worship her..well.she shouldn't be sleeping with him...