The Womb of God

The heroine, Aylin, runs away from the male-less society in which she has been raised to find her twin brother, Nohl, from whom she has been separated since childhood. In her people's mythology, their planet of origin was spoiled by the violence and greed of men, after which God angrily destroyed it, sparing only a small band of women who left the planet carrying the secret of cloning. But the art has been lost, and the women must produce daughters by arranging matings with men from the planet on which they have settled.
Aylin stows away with a woman pilot and arrives in the misogynistic men's lands. She spends a year in male disguise at a school where she hopes to find her brother. But her lover betrays her female identity to the officials of the school, and she is arrested. Fighting free of the police, she shelters with an underground women's resistance cult in the city.
Aylin is at last reunited with the pilot, who has located Aylin's brother. They achieve psychic contact with the leader of the spared women.
Aylin thwarts the school's attempt to gain the secret of cloning and perhaps do away with women. Aylin and Nohl lead their friends to an unsettled land where they start a new nation, hoping that men and women can live harmoniously together.