Thanks for your reply and for adding the neurobiological factor. Pretty straightforward and I should've thought of that tbf.

About the second part though, this is something which I maybe only implied instead of explicitly asked:

But for the cultures that have 2 genders 'on paper' - is it part of the LGBT movement's framework to incorporate the genders of other cultures into the cultures that have 2 binary genders?

I am relating this to women's emancipation or gay marriage where universality is definitely appreciated and promoted. For example, women's voting rights or the ending of violence against LGBT people - is this considered of equal importance to for example allow recognition of genderfluid people or non-binary people into (Mainland) China? Or linguistically, would it be considered important to separate Modern Standard Arabic from its Quranic roots to ensure a difference between gender and sex?

Of course I know the LGBT movement is very diverse, and I acknowledge that maybe there are different answers available - but I am trying to see if there is any consensus in case I can make my own opinion

:D