The Cleft. Doris Lessing. 2007.

Imagine a mythical society free from sexual intrigue, free from jealousy, free from petty rivalries: a society free from men.

The Clefts have no need or knowledge of men - childbirth is controlled, like the tides that lap around their feet, through the cycles of the moon, and they only bear female children. But with the unheralded birth of a strange new child - a boy - the harmony of their sexless community is suddenly thrown into jeopardy.