Ladyboy sex drives?

[CuriousGirl]

I can't help but think that sex drive among ladyboys/shemales varies based on several factors.
An older one may have diminished drive due to the natural aging process.
Taking estrogen can cause a loss of drive AND potency.
Castration will cause loss of potency to varying degrees, as in the case of the Thai ladyboy with whom I share both friendship and a sexual relationship. "She" was castrated in her teens before she came to the USA and has been a eunuch for perhaps eight years.
She is always eager to participate despite having no testicles and her very small penis manages to become at least semi-erect with the aid of fellatio and anal stimulation OR when she performs fellatio on my BF and, not surprisingly, when he fucks her, which I leave to him since I'm a genetic female, LOL!
She can achieve orgasm although there's no forceful spurting; just a little dribble of clear fluid.
I'm still confused as to whether total SRS kills "Sex Drive" as it is normally defined.

CG