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Why Testosterone Rex is extinct | Cordelia Fine

Mar 2nd, 2017 by

The differences between men and women is all the work of one hormone, right? Totally wrong, says Cordelia Fine

When a baby is born, their sex is usually the first thing we want to know about them. The last thing you’re ever likely to forget about a person is whether they are male or female. We often think of biological sex as a fundamental force in human development that creates not just two kinds of reproductive system, but two kinds of people.

At the core of this way of thinking is a familiar evolutionary story. Men’s much smaller minimum investment in a baby means that they can reap huge reproductive benefits from having sex with many different women; preferably young, fertile ones. Not so for a woman. What most constrains her is access to resources, to help her care for her biologically expensive offspring.

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