What a shame 'pansexuality' is the only moral choice given it doesn't actually exist rendering every single human being, all 7 billion and odds of us, immoral.
You see, McKinnon, there are two sexes, count 'em, male, female, one, two. There is no other sex. Just the two.
This means their are four possible sexual orientations.
heterosexual- exclusively attracted to the opposite sex
homosexual- exclusively attracted to the same sex
bisexual- attracted to both sexes
asexual- attracted to neither sex
The fact that some people are in denial of their sex does not any other sex produce.
This is not a question of philosophy but of basic arithmetic. Two sexes means two times two, ie four possible orientations. Everything else is attention seeking horseshit.