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Male genital mutilation makes it less likely that a male will manage to father a child with another mans wife, Wilson says.Home advantage Circumcision is one of the less painful forms of mutilation, but it is also less effective at reducing sperm competition.This causes sperm to be ejaculated from the base rather than the end, and is performed in several Aboriginal Australian societies, says Wilson.In some African and Micronesian cultures, young men have one of their testicles crushed.This behavior has puzzled anthropologists, doctors and theologians for centuries, and presents an evolutionary challenge since it involves dangerous and costly surgery.I suggest that MGM is likely to reduce insemination efficiency, reducing a man's capacity for extra-pair fertilizations by impairing sperm competition.

I also examined an alternative hypothesis suggesting that MGM signals group commitment for collective action, particularly inter-societal warfare.The husbands own reproductive ability is impaired, but continuous and repeated access to his wives makes up for it, while any genital mutilation is a greater handicap to an interloper trying to sneak brief occasional sex with his wives. The mutilation would also probably be carried out in a public setting, witnessed mostly by other men, and performed by a non-relative. Only 14% of the monogamous societies in the database practice male genital mutilation.It might also be the case that selection works at a group level, so that societies that enforce mutilation are more stable because of less conflict over paternity, Wilson says.Is there anything of which it may be said, “See, this is new”? By Kurt Kleiner Circumcision and other forms of male genital mutilation have always been a puzzle.

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