I had the distinct impression that the author first wrote the book, then went back and flipped a coin to determine the gender of each of the characters; rewriting the gender-specific pronouns as needed.
Reading the novels caught me offguard numerous times and made me realize just how much I think in stereotypes. An example is when a group is struggling along in a harsh winter and come to a small farm. They are met by the farmer who lets them sleep in the barn. It is casually revealed that the farmer is female. I had to erase and rewrite the pictures in my head!
Within the books, gender does not determine strength of body or character, nor does it determine roles in society. Very refreshing.
Similarly, some characters have dark skin, some light. Neither gender nor skin color is of any significance whatsoever to the characters in the novel. Yes, there is some reference to sexuality in the books. However, it is never either salacious or explicit. Some is casual and friendly, some is committed. Nothing much is made of it in either instance. Sexual contact is presented as an extension of friendship with never a hint of exploitation, dominance, or control entering into it. Yes, a lot of the sex is between same-gender persons, but so what?
Another dominant theme is that of "family." In the books a family is a committed group of friends who share purpose and share parenting of any children in the group. All women are Mother, all men are Father.
A good read with careful plotting and very well developed characters.