This book investigates the efficacy and methodology of natural family planning through the ovulation method. Mercedes Arzú Wilson, a noted advocate for natural family planning, presents a comprehensive guide based on extensive research and practical application. The work details the physiological signs of fertility and outlines a systematic approach for couples to identify fertile periods, thereby regulating conception. It aims to provide a reliable, non-hormonal method for family planning.

This text is recognized as a foundational work in the field of natural family planning, particularly for its detailed exposition of the ovulation method. It is often cited by proponents of natural methods for its clear instructions and scientific grounding. The book is generally regarded as a practical and informative resource for individuals and couples seeking to understand and implement this approach to family regulation.