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Regading penis Dixson showed that it is not really unique and complex. This argument (and there were some others) was used against the idea of human polygynandry.

But what about vaginal shape? I know it is wider as deeper it goes and cervix is convex shaped, which could give an advantage for storing semen. However, I am actually wondering if other primates have similar vaginal shapes (because it can shed light on the question of mating system). Are there any studies on the topic?

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  • $\begingroup$ Check the wiki page for clitoris and some mammalian orgasm research... ostriches have a clitoris and other species such as spider monkeys and spotted hyenas have clitorises as long as their male counterparts, so we are different form spider monkeys. $\endgroup$ – com.prehensible Oct 29 '18 at 18:51
  • $\begingroup$ @com.prehensible Well, I know, say, that bonobos have 3x larger clitores (given they are smaller). But I am asking about unique features of human vaginas, not primates'. I am pretty sure there are primates with clitores comparable in relative size with human ones. $\endgroup$ – rus9384 Oct 29 '18 at 18:59
  • $\begingroup$ This page talks about labia aquatic-human-ancestor.org/anatomy/sexual-features.html $\endgroup$ – com.prehensible Oct 29 '18 at 19:46

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