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}}</ref> It has been proposed that the foreskin evolved to facilitate [[masturbation]].,<ref>{{REFjournal

}}</ref> but, in accordance with Darwin's principles of survival, it is more likely that the [[gliding action]] of the prepuce facilitates penetration and fertilization of the female. The human prepuce has an increase in corpuscular innervation and concomitant decrease in corpuscular receptors in the human [[glans]] compared to the prepuce and glans of lower primates, demonstrating an evolutionary advancement.<ref>{{REFjournal