Three Essays on the Theory of Sexuality is a monograph by Sigmund Freud which codified one of his personal theories. The three essays deal with aberrant sexual desire, sexual desire in childhood and its shaping of adult sexual life, and the maturation of sexuality into a genital-focused force in adolescence. The three essays comprise a comprehensive approach to mapping and tracking the blooming of human sexuality in Freud's outdated clinical model.
This is a good choice if you're looking for a quick read or refresher rather than an in-depth analysis. You'll get a brief book summary and chapter by chapter breakdown. The website loads quickly with minimal advertising.