A 2006 study determined that 1-testosterone has a high androgenic and anabolic potency even without being metabolized, so it can be characterized as a typical anabolic steroid. 1-Testosterone binds in a manner that is highly selective to the androgen receptor (AR) and has a high potency to stimulate AR-dependent transactivation . In vivo , an equimolar dose of 1-testosterone has the same potency to stimulate the growth of the prostate , the seminal vesicles and the androgen-sensitive levator ani muscle as the reference anabolic steroid testosterone propionate , but, unlike testosterone propionate, 1-testosterone also increases liver weight. 
I’m just shy of age 71. I’ve always had a high sex drive, still do. I’ve only had two T tests, three years ago, 260, recently, 290. I don’t know if that was normal variation, or due to progesterone cream applications over the last few years. My Medicare insurer turned down a prescription the urologist wanted for Androgel. To help with weight loss. Despite those T numbers, I’m still randy as hell, and despite my alcohol consumption, my balls are still huge per internet sources. And many lovers over the years. (The urologist didn’t say anything was wrong.) The other morning I woke up with wood, walked out to the patio, and urinated a strong stream with a dick curving heavenward.
Great article, well written and god conclusions of collected data.
How ever I am still curious if creating a “shortage” of sperm and decrease of testosterone by cycles of repeated ejaculations during a short period of time, maybe during the course of hours followed by “rest-days” if that over time would provoke the body to produce more Testosterone and sperm in a response to “progressive overload”.
Since this is the way the body handles a lot other things that challenges it´s system with everything from resistance-training, “repeated skin-abrasion”, bacteria and even some toxins.