Group marriage in SF
Group marriages, poly/nonmonogamous, sexuality separated from childrearing, etc.
- Francesca Lia Block, Dangerous Angels: The Weetzie Bat Books (1998). This collects five short novels in one book. Weetzie Bat (1989) - Witch Baby (1991) - Cherokee Bat and the Goat Guys (1992) - Missing Angel Juan (1993) - Baby Be-Bop (1995)
- Candas Jane Dorsey. Black Wine
- Camarin Grae. Stranded (In the protagonist's home world, 3-way relationships exist and are respected, although it is acknowledged that they can be difficult. On Earth, 3 of the characters in this novel decide to attempt such a thing also.)
- Robert A. Heinlein. Friday and others. Heinlein mastered the art of coming up with reasons and social forms for women to get it on with each other and men, but for men to stay largely manly and heterosexual.
- Ursula K. Le Guin. The Ekumen / Planet O stories: "Mountain Ways" and "Unchosen Love" [four person marriages are the social norm]