It could function to reduce a young mans potential to father a child with an older mans wife, he says.
Sperm competition theory predicts that males will evolve ways to ensure that their sperm, and not another males, fertilises a females eggs.
By Kurt Kleiner Circumcision and other forms of male genital mutilation have always been a puzzle.
The ritual mutilations can leave the man vulnerable to infection and even death.
There is subincision, for example, where cuts are made to the base of the penis.
If you want to join a discussion group we recommend the Yahoo group Intercirc - we have no formal connection but both have ancestry in the now long defunct Circlist group.
Genital mutilation, in this view, is just another way to win the sperm war.
In some forms of mutilation, the handicap to sperm competition is obvious.
This is a section for readers to send in their own experiences of, and views about, circumcision.
Please, we want factual accounts, not fantasies, and while sexual matters have to be discussed we do not want 'steamy porn'.