You are selling yourself short- For example- HCG treatment often increases libido more often than by using testosterone alone.
besides testestosterone, which other hormone(s) from the testes which improves libido? testes make a number other hormones, and most of them are positively influenced by HCG. (Tough sometimes HCG can deplete (initally) pregnenolone so very often preg is good addition).
Exception would be peopel who are "primary hypogonadal" meaning their testicles dont respond to LH, so they would not respond to HCG either.
Some people with "secondary hypogonadism" are quite fine on "HCG monotherapy".