This book, written by Russian scientist Vladimir Antonov, Ph.D. (in biology), contains a scientific description of the mechanisms of development of the human reproductive system, including the embryonic period, childhood, and adolescence. The book also contains a thorough description of the mechanisms of formation of homosexuality in both sexes. Various results from experiments conducted on animals, in relation to this subject, are also described. Much attention is given to the methods of regulation of the sexual function: from choosing an appropriate diet - to the methods of psychic self-regulation, including work with chakras and meridians. A significant part of this book is dedicated to the bioenergetic aspect of sexual interaction, sexual psychology, and ethics. The author suggests viewing sexuality as an opportunity of spiritual growth through correct development of the emotional sphere, refinement of the consciousness, and ethical self-control. At the end of this book, there is a comprehensive bibliography. This book is intended for specialists-scientists, physicians, psychologists, and for the general public.