The notion of the genital stage was added to the "Three Essays on the Theory of Sexuality" (1905), by Sigmund Freud in 1915. In order, these stages of psychosexual development are the oral stage, anal stage, phallic stage, latency stage, and the genital stage. This stage begins around the time that puberty starts, and ends at death. According to Freud, this stage reappears along with the Oedipus complex. The genital stage coincides with the phallic stage, in that its main concern is the genitalia; however, this concern is now conscious.