The book Schenk's Theory: Gender Determination by Samuel Leopold Schenk is a detailed study of the theory of sexuality and the process of determining gender in humans. The book examines various aspects of the influence of genetics, environment and other factors on the formation of sexual identity. The author systematically analyzes scientific data, compares empirical observations and draws his own conclusions regarding the processes occurring in the human body during gender determination. This book is an important source of information for scientists interested in developmental biology and the physiology of sexuality.