To me sex drive and sexual function are two different things. My sex drive, or desire to have sex, has diminished greatly, but things still work mechanically. I can get aroused and orgasm, but barely anything comes out (due to HRT). My sex drive being in the toilet, however, I don't feel like having sex anyway, so it does not really matter.
Erections and a male erotic drive were troublesome for me, so the effects of HRT were very welcomed. Being in my forties and having already had sexually active relationships gives me a different perspective. Libido is the energy of life, and loss of libido at a young age may seem scary; not as much at 43.