Definitely seems like the vast majority of couples that have had difficulties conceiving finally do by regaining inratesticulat test, hCG, hMG, and a SERM like clomiphene, enclomiphene, tamoxifen citrate.
When someone says they didn't 'slip one past the goalie' until beginning SERM/AI therapy, that tells us HPTA recovery (also called HPGA) is an important factor in number and motility. Of these, I read a study years ago that said with a high degree of certainty that Aromasin (exemestane) is superior to all of them in terms of raising testosterone while decreasing estradiol, estrone. This was just 10days of Aromasin in young male subjects by the numbers (pretty impressive IMHO):