A mitologia explica tudo!

Hera and Zeus were once arguing about whether a man or a woman received the greater pleasure from the sexual act. Zeus said that women enjoyed it more and Hera believed that it was the man that was luckier in receiving the pleasure. The two deities decided to contact Tiresias, who had experienced the sexual act as both man and woman. He said that if the pleasures of sex were divided into ten parts, the man's pleasure was equal to only one of those parts while the other nine were endured by the woman.

[daqui, isto é pelo menos tão científico como um estudo realizado numa universidade norte-americana, só é pena porque acabou por ser ele a ganhar a discussão.]