Phallic morphology and female orgasm

The correlations between primate mating systems and the morphological complexity of their penes discussed in Chapter 3 in relation to sperm competition are also consistent with Eberhard's hypothesis concerning cryptic female choice (Eberhard 1985; 1996). Thus, it is the case that, in those primates in which females have multiple partner mating systems, males have the longest and distally most complex penile morphologies (see Figure 3.22). Selection for more complex penes may also have occurred in response to pressures dictated by the female's anatomy and physiology, and not solely by sperm competition. Relationships between sperm competition and cryptic female choice are likely to be complex, however, and difficult to distinguish in

Sexual selection at copulatory and post-copulatory levels

Sperm competition

Cryptic female choice o

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