Oedipus complex desire (libido) for mother, and aggression towards father, student–collaborator Carl Jung counter-proposed that girls experienced desire for father and aggression towards mother via the Electra complex—derived from the 5th-century BC Greek mythologic character Electra, who plotted matricidal revenge with Orestes, her brother, against Clytemnestra, their mother, and Aegisthus, their stepfather, for their murder of Agamemnon, her father (cf. "Electra", by Sophocles). Moreover, because it is native to Freudian psychology, orthodox Jungian psychology uses the term "Oedipus complex" only to denote a boy's psychosexual development. In classical Freudian psychology the super-ego, "the heir to the Oedipus complex", is formed as the
Psychosexual development years, wherein the child's genitalia are his or her primary erogenous zone. It is in this third infantile development stage that children become aware of their bodies, the bodies of other children, and the bodies of their parents; they gratify physical curiosity by undressing and exploring each other and their genitals, and so learn the physical (sexual) differences between "male" and "female" and the gender differences between "boy" and "girl". In the phallic stage, a boy's decisive psychosexual experience is the Oedipus complex, his son–father competition for possession of mother. This psychological complex derives from the 5th-century BC Greek mythologic