Gerhart Hauptmann's novel The Island of the Great Mother or the Miracle of the Île des Dames: A Story from the Utopian Archipelago was first published (in German) in 1928, but 90 years on, it still reads appositely, especially for the pagan community.
Here's the story.
A passenger liner filled with women (they're going to a women's convention) is shipwrecked somewhere in the Pacific. Several hundred women, with only one male among them—the prepubescent son of one of the castaways—are washed ashore on an uninhabited island.
There they create a glittering women's civilization, with its own gynocentric culture and religion.
Then something amazing happens. One by one, the women begin to become pregnant and give birth.
It's one of the novel's great strengths that these mysterious pregnancies are never explained. Hauptmann makes it quite clear that they are not, in fact, due to the only surviving male on the island, now grown to adolescence. They arise, apparently, as an inherent quality of the island itself.
Well, but there's trouble in utopia. Half the children born are female, half male. What to do with the males?