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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.
Sperm competition theory predicts that males will evolve ways to ensure that their sperm, and not another males, fertilises a females eggs.
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.
MGM rituals should facilitate access to social benefits; they should be highly public, watched mainly by men, and performed by a nonrelative.
I found support for these six predictions in two cross-cultural samples.
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.