The study of the development of the sexual nature in people, from early childhood. This book is the authority for anyone studying or practicing therapy or the sciences, and should be a reference book for every parent to understand the development of their children. Albert Moll was a German psychiatrist and, together with Iwan Bloch and Magnus Hirschfeld, the founder of modern sexology. Moll believed sexual nature involved two entirely distinct parts: sexual stimulation and sexual attraction.