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10-Aug-2017 12:49 by 4 Comments

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Therefore, when the foreskin retracts during an erection, most of the penile shaft, the pars medialis, not just the glans, is exposed.In other great apes, the glans itself is less well defined than in Homo.

He points out that humans must learn many skills before men and women are self-supporting.

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.

The loss of the baculum probably goes with the greater diameter and non-retraction of the human penis.

It is probable that some changes relate to the changes in the female reproductive tract associated with bipedal locomotion, and the need for the birth canal to permit passage of the much larger human head.

Humans arrived in Australia 50,000 years ago and their paleolithic hunter-gatherer society was maintined until recent times. Humans most likely evolved as a circumcising species.

Those cultures that do not currently circumcise are ones that stopped doing it, not those that did not ever adopt circumcision [Cox & Morris, 2010].This created an uniquely human paradox - adolescents needed to go through puberty in order to develop the bodily strength required for adult skills, yet it was important for them not to use their biological ability to reproduce during this learning period.Such a situation favoured natural selection of modifications to the genitalia capable of hindering early intercourse.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.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.

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