Developmental stages

"Freud talked about the sexual instincts as having developmental stages. In the oral stage, satisfaction comes from taking things in through the mouth or biting things. In the anal stage, pleasure comes from holding onto or letting go of faeces. In the phallic stage, sexual satisfaction is associated, for a boy, with the genitals, but there is no sexual activity because the object of such activity – the mother – would be inappropriate. For a girl this stage notoriously includes her discovery that she is without a penis. In the genital stage the sexual instinct matures and turns its attention to reproduction."
('Foundations of Psychological Thought: A history of psychology' Ed: Barbara F. Gentile and Benjamin O. Miller, p. 366 Sage)