High Mark, I saw your below thoughts on sunlight and testosterone, there is a book named Cultivating Male Sexual Energy by Mantak Chia and Michael Winn. Check it out or e mail me and I’ll send the chapter to you. It has My favorite unconventional way to increase testosterone is solar irradiation of the scrotum. I swear I read this in an old journal years ago but can no longer find the reference. Can anyone help? It’s plausible, seeing as how taking vitamin D to correct a deficiency can increase testosterone levels. There’s no better way to get vitamin D to your testes than with the application of direct sunlight.