The Left Hand of Darkness has a human species (the diaspora changes over the time and galactic distances involved, to produce more than one homogeneous species of human) which switches between sexes and gender when it comes time for them to mate. So, they may be 'mother' to one child, but 'father' another in a different 'breeding cycle', if you will. It is a brilliant book, but could be considered heavy-going. I read it in chunks, allowing digestion/cogitation time.
There's a species in Becky Chambers' TLWTASAP which changes sex over it's life span, starting off female, but being male later.
James Tiptree Jr covered a lot of gender and sexuality issues.
There's a species in Becky Chambers' TLWTASAP which changes sex over it's life span, starting off female, but being male later.
James Tiptree Jr covered a lot of gender and sexuality issues.