The proposed book contains an exhaustively complete and objective overview of all aspects of human sexuality. G.F. Kelly, a well-known American sexologist, managed to create an extremely informative, and at the same time easy-to-read text, which will be an excellent guide for everyone who wants to get an adequate understanding of the modern understanding of the problem of gender. For a wide range of educated readers interested in the history of sexual culture, issues of sexual development and education. The book can be used as a textbook for a sexology course.