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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].
The hypothesis of Cox [Cox, 1995] provides the only consistent explanation for pan-global circumcision traditions.
He points out that humans must learn many skills before men and women are self-supporting.
Both conditions were painful impediments to first intercourse.Instead, the foreskin is always loose, and retracts with erection.Interestingly, in the orang-utan (Pongo) the glans is exposed in juveniles, but not in adults, which is the complete opposite to what occurs in humans.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.