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The Effects of UV Light on Testosterone
If you put polyester on your balls, it appears to have a negative effect on sperm and hormone production independent of the fact that you're sucking your balls up near your body. A study from the 1960s actually sent this to my buddy Andrew Huberman. Whether or not you can get more testosterone from sunning your testicles is still up for debate. So I think it's pretty clear that ultraviolet light is good for testosterone.