This has only just occurred to me, but I think it's relevant. Forgive me if its a bit unclear, I'm just working it out.
I think it's reasonable to posit that a majority of the population are mostly heterosexual, that us, their primary sexual attraction is to members of the opposite sex?
And that for pretty much everyone, sexual orientation is innate and, the occasional experiment aside, not conducive to alteration?
It seems that most people who transition in either direction, retain their primary sexual orientation - so straight men who become transwomen retain an attraction to women; gay men retain an attraction to other men, & etc.
If though, it is true, that gender identification is innate; whatever their biological physicality, that person is internally a member of the opposite sex, why does it appear that in defiance of population statistics, a majority of transwomen seem to identify as lesbians?
I did find some statistics, although there's a certain bizarro world experience interpreting them.
"This leaves less than ¼, or 23%, of transgender survey respondents identifying as straight. Trans people who are straight – trans women who are only romantically and sexually interested in men and trans men who are only romantically and sexually interested in women .."
I'd make the assumption that "straight" trans folk previous sexual orientation was likely homosexual, and the "homosexual, queer, etc" portion were mostly heterosexual in previous identities.
From here: www.thetaskforce.org/wonky-wednesday-trans-people-sexual-orientation/
My point is that sexual orientation is a much stronger component of human identity for most people, than their gender identification. Transitioning to live as a member of the opposite sex doesn't tend to alter orientation.
This makes it even more unethical for transwomen to argue that lesbians should ignore their sexual preferences in order to provide transwomen with sex.
You can't argue on the one hand, that your gender identity is innate and must be validated by everyone, but that other people's primary sexual orientation should alter to meet your demands.