Humanae Vitae predicted the disintegration of marriage and family life, partly as a result of the widespread use of contraception. Pope John Paul II has since articulated a fresh understanding of marriage, love and sexuality which takes account of the dignity of the human person, and especially of women. Mary Shivanandan examines the scientific data and the theological analysis that underlie these teachings on marriage and sexuality. Her book will be an essential text for the study of the development, meaning and implications of Catholic doctrine in this controversial area. Its appearance marks a new stage in the debate over sexuality in the modern world.