haikujaguar is crowdfunding a collection of short stories,
Clays Beneath the Skies. This will contain 7 short stories plus illustrations featuring the Jokka, a race of aliens with three sexes (male, female, and neuter). I've read many of the Jokka stories, and I love them. The Jokka have two puberties and can change sex at either or both, which may or may not affect their gender identity or their interest in sexual partners. A lot of different combinations have appeared across the fiction. Sex shapes the characters' lives because the females are very fragile, the males in-between, and the neuters are durable ... and the world is suffering climate change that just makes life harder.
These stories are among the best sociological science fiction and gender fiction that I've ever read. Go throw money if you have it to spare and you like this sort of stuff. It will totally be worth your while.