I don't think it matters. However, I'm going to get shit on for this but, my take on it is; biologically it's homosexual, but socially/mentally straight. I say mentally because I cannot think of the word. I consider it heterosexual because for example in my own experience, I don't suffer from dysphoria, I transitioned a long time ago from male to female. I'm me, I happen to be female, I happen to have a dick. That is not to say those who still feel incomplete and dysphoric aren't valid, because they absolutely are. We all are valid. I'm just saying I have reached a place of reasoning where the whole "is dis ghay or not" not only isn't an issue, it's straight because at the end of the day a transwoman is a woman. And, vise versa for the other cases.
Anyway, I wish people would just be free and happy to like what they like, and not have to be judged for it.