In addition, sex -- whether it be a one-night stand, a booty call, or "friends with benefits" -- takes a different toll on women than it does on men.  When we reach orgasm our brain becomes flooded with Oxytocin, the chemical of attachment, leading to feelings of intimacy and affection.  Men have higher levels of testosterone in their brains which may help to counteract this chemical, but women are not so lucky.  Thus, no matter how much women may wish they could "have sex like a man," we are not physically programmed to do so.