It's always comical on this forum when they claim that TRT solves all sexual problems. In reality, TRT resolves problems only when they were due to really low T before TRT, but many people get on TRT to "enhance" themselves, not because they actually had low T.

Testosterone is a weak manipulator of dopamine/libido. For example, TRT boosts libido typically during the initial honeymoon period but then the negative feedback kicks in, dopamine receptors downregulate, and libido goes back to zero.

If you want to enhance libido, it's more sensible to look into direct dopaminergic drugs, like the Amantadine study that I cited. Testosterone is a secondary drug and quite ineffective at manipulating dopamine, unless it was really low before TRT, causing low dopamine, in which case restoring the normal testosterone levels restores dopamine and libido.