All of this is beside the point that Scott is trying to make though but certainly interesting to think about. Lots of professions have intelligence floors then select for other traits over the floor level. Some professions just need as much raw brainpower as humans can provide and so select only for that. Other professions have low intelligence floors but high floors for other traits such that high intelligence people do them better all else being equal (they give IQ tests to every NFL draft prospect, for example) but the people in that profession aren’t selected specifically for intelligence.
Other significant adverse effects of testosterone supplementation include acceleration of pre-existing prostate cancer growth in individuals who have undergone androgen deprivation; increased hematocrit , which can require venipuncture in order to treat; and, exacerbation of sleep apnea .  Adverse effects may also include minor side-effects such as acne and oily skin, as well as, significant hair loss and/or thinning of the hair, which may be prevented with 5-alpha reductase inhibitors ordinarily used for the treatment of benign prostatic hyperplasia , such as finasteride .  Exogenous testosterone may also cause suppression of spermatogenesis , leading to, in some cases, infertility.  It is recommended that physicians screen for prostate cancer with a digital rectal exam and prostate-specific antigen (PSA) level before starting therapy, and monitor PSA and hematocrit levels closely during therapy.