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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.Because circumcision reduces the diameter of the shaft immediately behind the glans and accentuates the coronal ridge, weve speculated that the practice of circumcision may have unwittingly modified the penis in ways that enable it to function as a more effective semen displacement device. My prediction would be that circumcised males ought to experience a lower incidence of being cuckolded.
Wilson suggests, however, that the lack of a foreskin could make insertion or ejaculation slower, meaning brief, illicit sex is less likely to come to fruition and lead to a pregnancy.
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.
I suggest that MGM is likely to reduce insemination efficiency, reducing a man's capacity for extra-pair fertilizations by impairing sperm competition.
MGM may therefore represent a hard-to-fake signal of a man's reduced ability to challenge the paternity of older men who are already married.