The trouble with testosterone

Testosterone and estrogen.  We all have some of each, but it’s the concentration that, for simplicity’s sake, make guys guys and girls girls. Women have more estrogen, men have more testosterone. Too much testosterone for women can make them more aggressive (female litigators and hockey players, for example, have higher-than-average testosterone levels). And too much estrogen (or not enough testosterone) has been linked with all sorts of negative side effects for men, including:

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