

Yeah. I think sex as a general classifier is not very useful, both in a colloquial and also medical context. I know that firsthand due to taking HRT, which already causes very medically relevant changes but of course not across the board for all sexual characteristics. But I wanted to keep it relatively short :)
Okay, to avoid confusion maybe I should use the same term you used, which is sexual preference, and not sexual orientation. This is what I’m talking about (from your OP):
The only one who talks about this in the linked comment chain is the other person, and only tangentially.
So, again I suppose, in which way do you think this is part of gender?