Free T levels are important. DHT is important. E2 can spoil the party.
Many here have had the best libido and sex in their lives on TRT.
Libido is a measure of one's state of health. There are four major hormone concerns:
* testosterone FT&TT, E2 and DHT
* thyroid function
* Vit-D25 - this is an essential hormone made from Vit-D3
Sleep and neural transmitters play important roles.