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Because of this there was a selective advantage in deferring reproduction for quite a while beyond puberty.Those couples who delayed reproduction were likely to have a higher number of offspring who survived, because they were in a better position to support such children.What’s more, it does not retract into the body cavity when flaccid.Some of these modifications are most likely to be related.But once virginity had been lost they no longer impeded reproduction.So today, in Western Europe, parents commonly intervene to make the foreskins of boys retractable, but in countries where this is not practised, the majority of young adult males suffer from phimosis (see later section on physical problems and phimosis) Once these obstacles have been overcome and intercourse has occurred, the foreskin is redundant and explains why, in adult males, it often does not cover the glans.

In the great apes phimosis is unknown, even in infants.

The penis of humans (Homo) differs considerably from the penis of the other hominids – Pan, Pongo and Gorilla.

The fold which forms the foreskin of great apes is attached to the proximal part of the shaft.

Females developed a hymen and males developed a penis in which the prepuce, by being phimotic, impeded erections and thus successful penetration of the female.

Both conditions were painful impediments to first intercourse.

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