Just brainstorming here, and these thoughts are certainly not set in stone...
I'm not attracted to men who identify as women (or haven't been yet, though admittedly, my exposure levels to this group are vastly different to that of male presenting males).
However, it's certainly the case that there are people who are exclusively attracted to both women and transmen. It's also the case that there are women who are exclusively attracted to both women and transwomen. There are probably also women who are attracted to anything BUT males. And every other combination possible, of course!
It strikes me as being fairly obvious that it's at least a quaternary, being attracted to:
same sex, same gender
same sex, other gender
other sex, same gender
other sex, other gender
I can understand that women who are attracted to women and transwomen want to call themselves lesbians, particularly if they subscribe to the view that twaw. And I can see they would feel that it was somewhat offensive to them to suggest that they are actually bisexual, given that usual meaning of this is to be attracted to male identifying males as well.
Unfortunately, the amount of combinations possible would mean we would need at least 50 new words even before we take NB into account. Given that there are four quadrants (at least, like I say NB would increase this even further), this gives 13 possible combinations of quadrant for each type of individual. Given TW are not going to want to sit in the M category, we have at least 4 different base individual categories. So, 4 x 13 words needed. Without including NB.
I'm quite curious as to how many people are single quadrant attracted vs being attracted to an entire axis. And is being "genitally" attracted any more common than being "gender" attracted?
Any thoughts?