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"However, although Martin regularly brings his focus back to human beings, his analysis is sometimes imperfect. Thus, when discussing human polygyny (our "natural," biologically inclined mating system), he appropriately describes sexual dimorphism. The presence of males consistently larger than females correlates strongly with male-male competition, and so with harem-based breeding. But he would have made a stronger case had he mentioned two other key pieces of evidence for our polygamous nature: behavioral dimorphism (the tendency of human males, even juveniles, to be more aggressive than females) and the well-described asymmetry between men and women when it comes to preferring multiple sex partners.

Martin also fails to mention sexual bimaturism. One would logically expect that females would delay breeding until they are older, larger, and better able to undertake the demands of pregnancy and lactation, while males should begin when younger and smaller, since their only biologically mandated investment is a trivial squirt of semen. And yet it is a cross-cultural universal that girls become mature earlier than boys, a pattern found in all polygynous species. Why? Because the "harem-keeping" sex is forced to engage in strenuous social competition with other harem-master wannabes. Add the fact that more than 85 percent of human societies were preferentially polygynous before the cultural homogenization generated by Western missionaries, and humanity's "natural" harem-keeping proclivity is essentially proven." 

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