Phallic stage the female aspect of phallic-stage psychosexual development as the feminine Oedipus attitude and the negative Oedipus complex; but his student–collaborator Carl Jung proposed the "Electra complex", derived from Greek mythologic character Electra, who plotted matricidal revenge against her mother for the murder of her father, to describe a girl's psychosexual competition with her mother for possession of her father. Despite mother being the parent who primarily gratifies the child's desires, the child begins forming a discrete sexual identity — "boy", "girl" — that alters the dynamics of the parent and child relationship; the parents become the focus of infantile libidinal
Oedipus and the Sphinx pass. Failure means his own death and that of the besieged Thebans. The riddle was: "What walks on four feet in the morning, two in the afternoon and three at night?". Oedipus answered: "Man: as an infant, he crawls on all fours; as an adult, he walks on two legs and; in old age, he uses a walking stick". Oedipus was the first to answer the riddle correctly and, having heard Oedipus' answer, the Sphinx was astounded and inexplicably killed herself by throwing herself into the sea. Oedipus thereby won the freedom of the Thebans, the kingdom of that city