These human sexual characteristics are very unique compared to those of great apes, and they are not always consistent with those often observed in other primates that have a monogamous mating system (which is dominant in human society). This deviation of humans may reflect the social features that our ancestors had in the past.

■References (Books, papers, Web articles, etc.)
『人間の性はどこから来たのか』　　榎本知郎　（平凡社、1994）
『性の人類学―サルとヒトの接点を求めて』　　高畑由紀夫編著　（世界思想社、1994）
『人類進化論——霊長類学からの展開』　第四章　霊長類の性と進化　　山極寿一　（裳華房、2002）
『性の進化、ヒトの進化−類人猿ボノボの観察から』　　古市剛史　（朝日選書、1999）

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■The References list of “Evolution of Human Sociality”