What are the signals that initiate sexual behaviors?

Estrogen may enhance the sexual appeal of females and then induce copulation with males, but copulation occurs even when estrogen levels are low. Hormones are not, therefore, the only factors controlling primate sexual behavior. Sexual swelling is an important signal of female estrous status, but in fact, it is not an “honest” signal.

■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)
ニホンザル、性の生理』  和秀雄 (どうぶつ社、1982)


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