´In my own marriage I paid such a terrible price for sex-ignorance that I feel that knowledge gained at such a cost should be placed at the service of humanity.´ The book that was to become Married Love grew from Marie Stopes´s conviction that the state of modern middle-class marriage was, like her own, desperate, and that the cause of this desperation was sexual unhappiness. She knew her book would ´probably electrify this country´ and it remains one of the best known sex manuals ever written. It combines a lyrical evocation of marital love with a no-nonsense and detailed account of sexual intercourse and sexual pleasure that was a sensation when it was published in 1918. Stopes advocated equality in marriage and the importance of women´s sexuality and sexual desire, as well as openly supporting birth control. In this edition of Stopes´s ground-breaking work, Ross McKibbin´s introduction reveals fascinating insights into Stopes and prevailing attitudes to class, religion, science, and above all, sex.