i just checked my therapist's notes and she used she/her on me the whole time😭 my favorite part is "Pt shared she tried to kill herself by hanging a few months ago, thought no one would ever see her as male."
Biological sex is not a spectrum. Why do these people always spread misinformation? The only exception would be intersex which makes up less than 1% of the population. Advanced biology literally says it's impossible to change your biological sex.
I know fandoms hate to hear this, but being straight and being cisgender is, in fact, the default. Anything else is by definition a deviation from the norm. LGBT comprises less than 5% of society (more lately due to social contagion). Assuming characters are straight is logical.