In classical psychoanalytic theory, the Oedipus complex is a son's sexual attitude towards his mother and concomitant hostility toward his father, first formed during the phallic stage of psychosexual development. A daughter's attitude of desire for her father and hostility toward her mother is referred to as the feminine Oedipus complex. The general concept was considered by Sigmund Freud in The Interpretation of Dreams (1899), although the term itself was introduced in his paper "A Special Type of Choice of Object Made by Men" (1910).