In response to the question "if you are non binary and only attracted to other non binary people, what is your sexuality?"
It was explained to me that straight does not mean as I always believed it to "attracted to people of the opposite sex" as implied by the term heterosexual but actually means attracted to people of the opposite binary gender. If you are attracted to people not of the opposite binary gender you are gay.
Which makes perfect sense given the erasure of Lesbianism and the insistence that "genital preferences" are nothing more than a fetish but I've honestly never heard it applied to heterosexuality before. It would be interesting to see how well straight men would accept this argument.