In both women and men, testosterone appears to regulate the seeking and maintenance of social status, including sexual status and the displays that go along with seeking attractive mates. Both men and women who are high in testosterone are more likely to engage in risky activities, such as gambling and having sexual relations with multiple partners. Indeed, most people in monogamous relationships show lower levels of testosterone than those not in committed relationships. You can imagine an evolutionary basis for this, that people in a committed relationship will do a better job at staying
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