Sigmund Freud 
Three Contributions to the Theory of Sex [PDF ebook] 

Remembered for having developed and popularized the field of psychoanalysis virtually singlehandedly, Austrian neurologist Sigmund Freud is regarded as one of the most significant thinkers of the early twentieth century. Psychosexual development is a key area of Freud’s body of work. This volume brings together in-depth discussions of three of Freud’s most innovative ideas about sex, sexual development, and their impact on the human psyche: sexual deviance, infantile sexuality, and psychosexual development during adolescence.