The book introduces the reader to natural methods of birth control based on the natural, physiological mechanism of the body's endocrine system. There are no universal methods of contraception. When choosing remedies for unwanted pregnancy, an individual approach is required. The purpose of this book is to help individual women or married couples plan pregnancy or delay conception, using their physiological rhythms in coordination with natural, cosmic rhythms. The book is intended for a wide range of readers. There are contraindications. A doctor's consultation is required first.