EDIT: Let’s cool it with the downvotes, dudes. We’re not out to cut funding to your black hole detection chamber or revoke the degrees of chiropractors just because a couple of us don’t believe in it, okay? Chill out, participate with the prompt and continue with having a nice day. I’m sure almost everybody has something to add.
Not who you asked, but I feel it’s more of a social thing in myself. HRT has biological effects, but I don’t think I’d be doing it in the first place if gender wasn’t such a construct to begin with. I believe the sexuality changes are mainly social as well. There’s the transmasc meme that T makes you more gay, but I don’t think it makes us gay so much as make us more attracted to gay/bi men who actually validate our gender identities, whereas pre-transition, many of us avoided straight men who simply viewed us as female.