Ok, got to the end of this (so far). Despite seeing it start, it (naturally) ran faster than I could handle, and went through other bits I didn't care to reply to. (Or shouldn't reply to. e.g. I have to inform one contributor (I forget who) that being "apart of China" is an awkwardly ungrammatical statement that actually says the opposite of the intended "a part of China", but that could have been a typo...) But please do ignore that administrivia... My real points follow thus:
"What is between your ears" (gender) is one thing. It's hard to compare between people and social pressures (or personal will) might attempt to polarise the results, and possibly for most people it is clear and binary but I'm not sure that it can't be fluid over time, never mind tied down to one-or-the-other per person. - This may follow, but needn't, your genetic make-up. It can be more complicated than thatmand perhaps the uterine environment plays a part, but neurology is weird.
"What is between your legs" (sex) is another thing. For many people it is clear and binary, but there are definitely occasionally known ambiguities. Surgery can be had to do something about perceived wrongness, especially personal mismatch with the above (or forced upon the infant, to make it binary when it was not, by those who think they know best, despite having been subsequently shown to be wrong about that). - This may follow, but needn't, your genetic make-up. It can be more complicated than that and perhaps the uterine environment plays a part, but biology is weird.
"Who is between your legs" (sexuality) is yet another thing. It's not even a spectrum, but more multidimensional than that with at least two separate 'axes of preference' from not-at-all to definitely-do. It's almost certainly fluid and malleable by circumstance (but not such that any attempt should be made to force it to change to match other people's preconceived/indoctrinated expectations) with no necessary matching to either of the above situations, and natural and mutual happiness ought to be the ideal result, but there's no guarantee of that. - This may follow, but needn't, your genetic make-up. It can be more complicated than that and perhaps the uterine environment plays a part, but psychology is weird.
(Repeat for societal expectations - sociology is weird. Probably also repeat for personal expectations - psychiatry is weird. etc, etc.)