The more you play competitive sports, whether you're a girl or a boy, it tends to raise testosterone levels. It used to be girls got the message: 'Girls don't hit.' But now, even if you say that to girls, it's patently not true.

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You play lacrosse, you hit with a stick. You play hockey, you push a stick around. Soccer, you're tackling people. Some of the research shows that if you get involved in competitive sports, it raises your testosterone level, whether you're a boy or a girl.

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