Some years ago, when I was trying to get my wife pregnant, and having some difficulty, I was found to have a somewhat low sperm count. I was advised to try two things. First, I had been doing quite a bit of road bicycling on a drop bar bike, which has been associated with low sperm counts, due to the increase warmth generated by the saddle. I also switched from wearing briefs to boxers, for the same reason. It did seem to bring my sperm counts up.
It my be coincidence, but I noted over the next few years that I started to go from a “grower” to a “shower”. I started PE about 3 months ago mainly to see if it would improve erection quality. I also started taking L-arginine and Horny Goat Weed, which may have had some effect. With these supplements and PE I have had a significant further increase in flaccid size. I have been mostly just using the Newbie program, nothing special.
I have also started a general exercise program with aerobics and resistance work, and lost a bit of weight, which may have increased testosterone levels.