Heterosexual author writing Queer Characters?

I have a friend that - although the topic of sexualities hasn't really been discussed, just based on the way she explains herself, I assume - is heterosexual or at least heteromantic, and she only writes heterosexual characters. Literally, not once have I ever seen her make any sort of LGBT+ character, and we roleplay so even when my characters have had crushes, they're still straight. So it got me wondering -
Heterosexual/romantic authors, artists, etc., do you write queer characters commonly? I don't mean like token characters, the one or two that are gay to meet a quota, but like fully fleshed out queer casts? Being wlw myself, almost all of my characters are queer to some extent so I don't have a very good frame of reference, haha. But I'm really curious!