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Penile length

Baculum Distal Penile length complexity spines

Multi-partner mating systems

Single-partner mating systems

Figure 3.22 Penile morphologies are more complex in primate genera where females mate with multiple males (multi-male/multi-female and dispersed mating systems) than in those where single partners are the norm (monogamous or polygynous systems). Data are for forty-eight genera (including Homo), and show the numbers of genera which received the highest ratings (4 or 5 on a 5-point scale) for various traits (penile length, baculum length, distal complexity, and size of penile spines). *P < .05. Further details are discussed in the text.

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