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I also examined an alternative hypothesis suggesting that MGM signals group commitment for collective action, particularly inter-societal warfare.

Although other forms of male scarification fit this model, the distribution of MGM is not predicted by frequency of inter-societal warfare. put forward a theory that the shape of the glans has evolved with the function of pumping a rival's sperm out of the vagina, tending to ensure that a child born after that intercourse is that of the man concerned and not an earlier one.

READERS: The latex genitalia study wasn't terribly convincing because the models were circumcised, and in real life the foreskin would interfere with the semen-displacing functions of the coronal ridge.

So, does the foreskin pose a problem for the semen displacement theory?

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David Barash, an evolutionary biologist at the University of Washington in Seattle, US, says that the paper makes a convincing case. Journal reference: Evolution and Human Behavior (vol 29 p 149) Evolution & Human Behaviour, May 2008, Vol 29, Issue 3, pp 149-164 Male genital mutilation: an adaptation to sexual conflict Christopher G.There is subincision, for example, where cuts are made to the base of the penis.This causes sperm to be ejaculated from the base rather than the end, and is performed in several Aboriginal Australian societies, says Wilson.GALLUP: The length of the foreskin is one of the most variable features of the human penis.When most uncircumcised males achieve an erection it pulls the foreskin back over the glans and back down the shaft of the penis, enabling the coronal ridge to do its business and scoop rival males semen away from the womans cervix. The idea could be tested by comparing the incidence of non-paternity between circumcised and intact males.

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