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human mating systems. New York: Oxford University Press. p. 178. ISBN 978-0-19-955943-5. Thornhill, Randy; Gangestad, Steven W. (1993). "Human facial beauty:...

Origins of Human Mating Systems. Oxford University Press. p. 83. ISBN 978-0-19-955943-5. Encyclopedia.com: Penetration. 30 March 2023. Only the clitoris brings...