Wow! This is a fantastic, clever, wonderful scifi book. I loved the explicitly humanoid species (that are probably expanded on, especially their origin, in other parts of the series). I loved the mostly-androgynous species, their peculiarities, the mechanics of it all, the implications. I loved the protagonist and the carefully spun story arch - but I loved most that the narrator/protagonist was both clever, relatable, and fallible - there were several instances where, in the middle of narration, you started to think “Hold up, I’m sure that’s not quite ⦔ or “Isn’t that just your weird bisexual bias β¦?”
I also love the meta. My personal meta: This is where I started to get into sci-fi, really. The author’s meta: This book is clearly very early in the tradition of gender-based scifi, and as a consequence, some of it is conservative to say the least. The author was clearly a straight woman who was not very into feminist theory yet at the time. That shortly changed, and there is a very neat later essay(?) where she explains her journey towards feminism, very visible in her Earthsea series. I wish I could remember where to find it.