Three Contributions to the Theory of Sex

"Three Contributions to the Theory of Sex" by Sigmund Freud
Freud began his first essay, on "The Sexual Aberrations", by distinguishing between the sexual object and the sexual aim — noting that deviations from the norm could occur with respect to both. His second essay, on "Infantile Sexuality", argues that children have sexual urges, from which adult sexuality only gradually emerges via psychosexual development. In his third essay, "The Transformations of Puberty" Freud formalised the distinction between the 'fore-pleasures' of infantile sexuality and the 'end-pleasure' of sexual intercourse.