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Re:Testosterone levels show steady decrease among young US men by throwaway09223 on Thursday January 14, 2021 @02:45PM (#25781399)
It sounds like you're assuming evolutionary pressure as a mechanism of change, is that correct?

Have you considered that the body may produce different hormone levels as a result of our mental state?

For example, when startled, the body produces a hormone called adrenaline. We know with certainty that mental state is responsible for certain types of hormone production.

I honestly do not know if there might be a link between testosterone production specifically and mental state, but I took this to be the question that the above poster was asking.

Re:Testosterone levels show steady decrease among young US men by nitrogen on Thursday January 14, 2021 @02:51PM (#25781506)
I believe there was a study that found that sports fans' testosterone levels were lower after their preferred team lost.