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.
Being an incel:
>women criticizing you to the length of your penis
>even your looksmatch doesn't want you
>can't fraud your looks like women do
>punchbag for Chad lites to bully and rape
>the only option is to troon out with a success rate of 10%