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Among several examples, Berger cites research of rhesus monkeys at Emory University's Yerkes National Primate Research Center. Here, the females initiate sex, and when her partner tires, she finds a new one, explains Kim Wallen, a psychologist and neuroendocrinologist who studies the monkeys. Wallen wonders aloud whether women feel this drive but, due to social constraints, "don't act on or even recognize the intensity of motivation that monkeys do," and then answers his question: "I feel confident that this is true."