I did find this

Progesterone, like testosterone, in present in both men and women. It is a precursor to the adrenal hormones which include cortisol, androstenedione, and testosterone. Levels in men decline around 60 years of age. Progesterone protects the prostate gland and lower PSA. It not only inhibits aromatase but also 5-alpha reductase, raising testosterone levels and lowering both estradiol and DHT. It antagonizes the stimulatory effect of estrogen on the prostate gland and stimulates the anti-tumor antigen p53, helping to prevent prostate cancer. A low dose of progesterone may be part of male HRT

Anybody else using progesterone?