Ted, You haven't, as far as I'm concerned made any convincing argument why there needs to be critical analysis of why person A won't have sex with person B.
What is the point of such analysis? It cannot possibly be, and should not be, with the intention of changing anyone's preferences as to who they want to have sex with.
No one should be denied education , a job, a roof over their head, health care , the ability to participate in civil society just because the person in control of delivering those items dislikes the other person.
We have laws to ensure that should not happen. They don't always work but they are there for good reasons. The persons with power to deliver these items need to be sure they do not discriminate, either openly and deliberately or by unconscious bias. Studying this a valid concern.
For example I said there are certain regional accents which I find very unattractive. I also find people who are seriously into sport unattractive and often uninteresting. It would be entirely wrong of me to refuse to employ a man because of his accent or he was a rugby player. However there is no obligation on me whatsoever to consider him as a sexual partner. What legitimate difference does it make to his life? None.
Your argument was also muddled. You said in an early post:-
You, to person you’re on a date with: ‘I don’t want to sleep with anyone under 6ft’Date person: ‘oh really, why’s that?’ Innocent conversation
It is not "innocent conversation". It is asking someone to justify and explain their preferences.
Later you posted
Assuming this is aimed at me, I have never suggested anyone has the right to an explanation
which is outright contradiction of what you said in your earlier post.
Individual sexual preferences might be absurd, illogical even discriminatory but that is irrelevant when considering sexual partners.