Sigmund Freud - Three Contributions to the Theory of Sex This influential work by Freud explores the foundations of psychoanalysis, delving into sexuality’s role in human development, neuroses, and behavior. Freud’s ideas on childhood sexuality, libido, and the influence of unconscious desires challenged social norms and expanded psychology’s scope, though they remain controversial. This book is central to understanding Freud’s theories, particularly regarding human sexuality and identity.