The new book by the famous sociologist and psychologist Academician I.S. Kon, a leading specialist in youth psychology and the sociology of sexuality, provides a systematic comparison, based on the latest scientific data, of the main trends in the development of adolescent and youthful sexuality in Western Europe and Russia for the last half century. The book also contains articles on the psychology of adolescent and youthful sexuality, the history of Russian sexual and erotic culture, and global trends in sexual behavior and values in the modern era. The book is addressed to sociologists, psychologists, teachers, doctors, demographers, cultural workers and social workers, as well as parents and all those who are interested in the problems of modern youth in Russia and abroad.