Separatist societies

Genders (or sexualities) live apart, with little intermingling or only at fixed times.

Maybe one of them doesn't exist, for whatever reasons.)

Matriarchies have women on top, but not necessarily planned that way; maybe the men just died out; maybe it's a bad thing; whatever. Separatism always has the sexes living apart - often, this is in conjunction with a matriarchy, or is a lesbian separatist utopia, but not always.

Examples

• Eleanor Arnason. A Woman of the Iron People and Ring of Swords (1993)
• Free Amazon society in the Darkover series by Marion Zimmer Bradley (particularly in The Shattered Chain; Thendara House; and City of Sorcery)
• Glory Season by David Brin
• Ethan of Athos by Lois McMaster Bujold
• Adulthood Rites and Imago by Octavia Butler (the Xenogenesis series)
• The Passion of New Eve by Angela Carter
• Spartan Planet (aka False Fatherland) by A. Bertram Chandler; and sequel, The Last Amazon (a male-only society in the first story; amazon separatists try to take it over in the second)
• Holdfast in Walk to the End of the World and The Conqueror's Child by Suzy McKee Charnas (in Holdfast, men and women live apart)
• Motherlines by Suzy McKee Charnas - the horse women live together & are lesbian; the other women, some of whom are straight, live separately
• "Spinning the Green" by Margaret Elphinstone (in Despatches from the Frontiers of the Female Mind)
• Benefits by Zoe Fairbairns
• The Wanderground by Sally Miller Gearhart (women live apart; some gay men also live apart; cities are filled with horrible heterosexuals who haven't yet escaped)

• Ursula K. Le Guin. "The Matter of Seggri" (1994)
• Joanna Russ. The Female Man
• Sheri S. Tepper. The Gate to Women's Country
• Sheri S. Tepper. A Plague of Angels (1993) (one community has men and women living separately)

See also:

• List of works featuring intentional communities designed along gender lines - Intentional communities designed by women, however, are just that: they may include men or may not; they may or may not be matriarchies; they may or may not be utopias.
• Plus see all the stories in which the gender ratios are skewed.