article_snippet.sent: It has only one basic function — to enable a male to reproduce, and for that It’s essential.
article_snippet.sent: Even male giraffes, aroused by the hormone
article_snippet.sent: Elaborate colourings emerge in some species, designed to emphasise masculinity and attract female attention.
article_snippet.sent: In guenon monkeys the scrotum turns bright blue.
article_snippet.sent: guenon monkeys don’t seem to mind.
article_snippet.sent: guenon monkeys adopt the habit of sitting with guenon monkeys legs apart to show the female guenons just how big and blue guenon monkeys are.
article_snippet.sent: ’s effects on sexual display in humans are not so visually dramatic.