Environmental Quality, Not Genetics, Determines Testosterone Levels In Men

[Dr. B]

It is not clear from your syntax whether you are asking
1) "how do we know these are androgenic traits?"
or
2) "why have males developed these caracteristics?"

1) antropologic analysis, common observations, blood levels to physical traits linkage.

2) men have always been the one executing hard labor: developing a thick skin makes it harder for external threats to penetrate the dermis. Oily skin keeps the skin moisturized in tough weather.

is oily skin associated with acne or is that simply estrogen, cortisol, inflammation causing acne

 

[TheBeard]

is oily skin associated with acne or is that simply estrogen, cortisol, inflammation causing acne

Jason Statham, Mel Gibson and Bruce Willis are all very androgenic males with thick oily leathery skin and not one bit of acne.

 

[Dr. B]

Jason Statham, Mel Gibson and Bruce Willis are all very androgenic males with thick oily leathery skin and not one bit of acne.

how are they androgenic, theyre bald and dont have defined jaws? the rock, john cena, henry cavill etc are androgenic, their jaw development is greater and even the rock still has hair i think