Introduzione

Biologic aspects of procreation and human fertility; Natural Fertility Regulation as a lifestyle: knowledge, love and responsibility between husband and wife; The Billings Ovulation Method: history, scientific fundaments, spreading in the world; Practical and educative aspects of Billings Ovulation;  Method in different situation of woman reproductive life: Self-knowledge and love education in young people; From Humanae Vitae to Amoris Laetitia: how can we help people to live a responsible procreation?