This book takes place in a post-sexism, post-homophobia, post-transphobia setting. Easily half, or more, of the people in power are women, though such little fuss is made of gender that it’s easy to forget. The protagonist never identifies as a lesbian because there seems to be no need for such distinctions in her society; her preference for women is established as naturally incidental to the story as her preference for pickled vegetables. It is briefly mentioned as an aside that technology has allowed sex reassignment surgery to become not uncommon, and after a character is revealed to have a differently sexed body than they had before, it elicits only a brief moment of mild surprise in the viewpoint character, thus ending all thought on the matter.
Forewarning: there is a scene when a commanding officer rapes her subordinate, but it is brief, not graphic, and the subordinate is immediately comforted by a friend who validates his feelings and reassures him that he’s not responsible.