re: Testosterone Levels are decreasing 1+% per year and has been since the 80s

I think it's just a combination of things. There is some truth to the environmental/chemical issues. I just don't think our bodies are meant to be processing the amount of chemicals/metals/plastics/soy that goes into our bodies.

I think the bigger issues is modernity and feminism. Modernity had created too much comfort and leisure, amd feminism has killed masculine drive to build, protect, and provide. I would be willing to bet if you tested men in male dominated fields like construction, first responders, plant workers, etc. There T levels are going to be higher than men who work and compete with women all day. Also men in traditional marriage arrangements with traditional husband and wife roles, where the wife is in a supportive role, not a combative role... the man's T levels are pretty high. Men who don't look at porn or scroll the internet likely have lower T levels than men who do not.

The Universe 25 experiment was an interesting study. Worth looking into. They provided everything for the mice and gave them maximum comforts. The mice eventually they lost the drive to reproduce, and the entire colony exterminated itself.