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Everyone’s come across some article somewhere on-line that is thrilled to share how big human penises really are, for primates, and to explain why they evolved to be so big. It’s not really the length, but the girth. Alan Dixson is your go-to on this. He’s conservative in his assessment of the literature on penis size and even he concedes that human penis “circumference is unusual when compared to the penes of other hominoids (apes)” (p. 65 in Sexual Selection and the Origins of Human Mating Systems).
A favorite explanation for the big phallus is female mate choice, that females selectively make babies with males who have larger and, presumably, more pleasurable semen delivery devices. This is backed up by studies. When life size projections of naked men are shown to female subjects, they say they find the ones with bigger ones to be more attractive.
But doesn’t it make sense that for a penis to be somewhat useful it has to be somewhat correlated to vagina size?
We’re rarely, if ever, told that human penises are relatively girthy because human vaginas are. It’s always about male competition or female preference.
Read full, original post: Why Is the Human Vagina So Big?