Is there a relationship between red light therapy and testosterone?
Studies on rats have discovered that exposing their testis to red light increased serum testosterone levels without causing any negative side effects. That’s likely the reason why some people in the biohacking community have started tanning their genitals. Considering that exposing your genitals to red light (from artificial sources or natural sunlight) is non-invasive, there’s no reason not to give it a try.