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In some African and Micronesian cultures, young men have one of their testicles crushed.
Male genital mutilation makes it less likely that a male will manage to father a child with another mans wife, Wilson says.
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.
So, does the foreskin pose a problem for the semen displacement theory?So why do some societies insist on such a risky ritual for their men?