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The concept of psychosexual development, as envisioned by Sigmund Freud at the end of the nineteenth and the beginning of the twentieth century, is a central element in the theory of psychology. It consists of five separate phases: oral, anal, phallic, latency, and genital. In the development of his theories, Freud's main concern was with sexual desire, defined in terms of formative drives, instincts and appetites that result in the formation of an adult personality.