That's not true. Obstetricians are mostly women and are better paid (on average) than internal medicine, which is mostly men. There are other examples. If you

That's not true. Obstetricians are mostly women and are better paid (on average) than internal medicine, which is mostly men. There are other examples. If you assume men are willing to give up more (life span, time, stress, risk) for money than women, it has an amazing amount of explanatory power.