Electra complex classical psychoanalytic theory, the child's identification with the same-sex parent is the successful resolution of the Electra complex and of the Oedipus complex; his and her key psychological experience to developing a mature sexual role and identity. Sigmund Freud instead proposed that girls and boys resolved their complexes differently—she via penis envy, he via castration anxiety; and that unsuccessful resolutions might lead to neurosis. Hence, women and men who are fixated in the Electra and Oedipal stages of their psychosexual development might be considered "father-fixated" and "mother-fixated". As a psychoanalytic term for daughter–mother psychosexual conflict, the Electra complex derives from
Oedipus complex mother and directs jealousy and emotional rivalry against his father—because it is he who sleeps with his mother. Moreover, to facilitate union with mother, the boy's id wants to kill father (as did Oedipus), but the pragmatic ego, based upon the reality principle, knows that the father is the stronger of the two males competing to possess the one female. Nonetheless, the boy remains ambivalent about his father's place in the family, which is manifested as fear of castration by the physically greater father; the fear is an irrational, subconscious manifestation of the infantile id. "Psycho-logic defense"—In both sexes, defense