Originally Posted by
Aquillion
While I'd lean towards it being a throwaway gag, I also think it's important to remember that sexuality isn't a simple straight-bi-trans trinary any more than it's a binary - as I mentioned above, it's possible that eg. Durkon is a 1 or 2 on the Kinsey scale, recognizing that Roy is hot but still having an overall preference for females.
(The Kinsey scale itself is an oversimplification or abstraction too, of course. But it's a slightly more accurate abstraction.)