No one will argue that we enjoy experiencing orgasms because they feel good. Apart from that, we are aware that the overriding purpose of a male orgasm, physiologically speaking, is to send semen into the vagina for the purpose of fertilizing an egg within the uterus. However, not many people realize that there is a physiological purpose for the female orgasm as well. During the internal spasms of a woman’s orgasm, the mouth of the cervix dips down to “catch” any semen that may be present in the vagina, thereby helping pull sperm up and into the uterus. While it is by no means necessary for a woman to orgasm in order to become pregnant, her orgasm can increase the odds for conception to occur. http://blog.temptationsparties.com/2006/06/#2 However, I also found this: ...in a new book, Dr. Elisabeth A. Lloyd, a philosopher of science and professor of biology at Indiana University, takes on 20 leading theories and finds them wanting. The female orgasm, she argues in the book, "The Case of the Female Orgasm: Bias in the Science of Evolution," has no evolutionary function at all. Rather, Dr. Lloyd says the most convincing theory is one put forward in 1979 by Dr. Donald Symons, an anthropologist. That theory holds that female orgasms are simply artifacts - a byproduct of the parallel development of male and female embryos in the first eight or nine weeks of life. In that early period, the nerve and tissue pathways are laid down for various reflexes, including the orgasm, Dr. Lloyd said. As development progresses, male hormones saturate the embryo, and sexuality is defined. In boys, the penis develops, along with the potential to have orgasms and ejaculate, while "females get the nerve pathways for orgasm by initially having the same body plan." Nipples in men are similarly vestigial, Dr. Lloyd pointed out. While nipples in woman serve a purpose, male nipples appear to be simply left over from the initial stage of embryonic development. The female orgasm, she said, "is for fun." http://www.nytimes.com/2005/05/17/science/17orga.html?ex=1273982400&en=cf12910a3cea39b1&ei=5088&partner=rssnyt&emc=RSS