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Re:Testosterone levels show steady decrease among young US men by rriepe on Thursday January 14, 2021 @04:15PM (#25782674)
> Possible toxicity of something that we deem safe could be an explanation.

It's porn. Porn has proliferated right alongside this trend.

Re:Testosterone levels show steady decrease among young US men by castlecrasher2 on Thursday January 14, 2021 @04:50PM (#25783154)
I doubt this is the only factor, but I imagine it contributes. I suspect it's more due to sedentary lifestyles and high-carb/sugar/fat diet.