[gambling8nt]

I agree that lack of physical activity is another likely factor for changing hormone levels and their secondary effects.

However, I know of no reason to think that these changes are heritable, or that naturally low T is actually a reproductive advantage in our society. (Indeed, given that we have inverted the more typical historical trend of the wealthy out-reproducing the less wealthy, and the selection of low-T for wealth here asserted, one might expect that this society actually reflects reproductive pressure against low-T, rather than in favor of it.)