Yes, her "Tale of the Five" series features characters with a wide range of sexualities, living in a society that accepts and supports them all. There's a delightful scene in the third[1] featuring the polygamous wedding of (IIRC) seven people, which is delightful partly just because the only reason it's considered worthy of note is that some of those people are famous.

[1]and last published, so far; I wish she'd get on with the next - allegedly final - one :)

Of course, the main protagonist of the "Young Wizards" series is one Juanita Callahan (with the ethnicity that implies), which was/is itself shocking to certain (primarily USAian) audiences....