Overall distal complexity of the penis (the shape and size of the penile glans or the equivalent if a glans is lacking) is rated as 3.0 for Homo the same score as achieved by twenty-one other genera. However, sixteen nonhuman primate genera also score equally high for this trait.

Human beings do achieve a maximum score for one trait ( penile length). Leontopithecus, Callimico, Erythrocebus, Theropithecus) and less than the ratings given to twenty-seven of the forty-eight primate genera included in the study. This is the same rating as scored by a number of putatively monogamous or polygynous primates (e.g. The overall rating for all four traits analysed is 10 for H. Human penile morphology is not exceptional when compared to that of the prosimians, monkeys, and apes. MP mating systems for their various penile traits. Thus, Figure 3.22 shows the overall comparisons between SP vs. Multi-male/multi-female and dispersed mating systems are characterized by occurrences of multi-partner (MP) matings by females, large relative testes sizes, and higher sperm competition pressures among males. Polygyny and monogamy involve predominantly single partner (SP) matings by females and lower relative testes sizes among males. sapiens might equally be included with the monogamous primate genera for statistical purposes. The same rationale was applied to comparative analyses of relative testes sizes in human beings and non-human primates in Chapter 2.

Homo sapiens has been included in the comparative analysis as a polygynous primate species, on the basis that the majority of recent human cultures are at least partially polygynous (Ford and Beach 1951). Reflect a phylogenetic tendency among prosim-ians to exhibit this trait, and not just the effects of sexual selection (Harcourt and Gardiner 1994).

Size of a gorilla penis