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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.
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.
Both conditions were painful impediments to first intercourse.
It is most pronounced in Gorilla and not defined at all in Pan (chimpanzees).
In the great apes phimosis is unknown, even in infants.
It thus becomes obvious that circumcision arose as a means of regulating this entire process more precisely.
Circumcision was able to define exactly the age at which a male could begin reproduction.
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.