What does it matter? I mean, it's not going to be really all that important unless you're planning to sleep with a sizeable proportion of the population.
You only really need one person, ideally someone who's as attracted to you as you are to them.
I don't see much of the problem. There's even men and women out there who prefer trans folk as partners.
Why?
Well from the perspective of a transwoman
1. There's no risk of pregnancy.
2. We don't have periods, and therefore are unlikely to be affected by PMS.
3. To a woman who's lesbian or bi we don't have kids, are unlikely to be married or want to bring some creepy guy into the relationship 'to watch or possibly participate'.
4. We're usually not curious, not experimenting, and not fooling around with someone else's feelings.
5. We tend to be more discreet.
6. We tend to be pretty sure of who we are and who we prefer and what we are into.
If someone's genuinely into you as a person what you've got between your legs isn't really that big an issue.