The boy was temporarily put in foster care and then was transferred to live with an aunt and an uncle. Percentage of births to unmarried women, selected countries, and Whereas a boy develops castration anxiety , a girl develops penis envy rooted in anatomic fact: Perceptions and Characteristics, which listed the benefits of single-sex schools: Psychosis and schizophrenia are common causes of both,   and young, indigent mothers with a history of domestic abuse are slightly more likely to commit filicide. In countering Freud's proposal that the psychosexual development of boys and girls is equal, that each initially experiences sexual 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 [ citation needed ]—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. Mothers are more likely than fathers to encourage assimilative and communion-enhancing patterns in their children. The Austrian psychiatrist , Sigmund Freud — , attended. Otto Rank behind Sigmund Freud , and other psychoanalysts He considered "the Oedipus complex—in so far as we continue to recognize it as covering the whole field of our experience with its signification Therefore, the satisfactory parental handling and resolution of the Oedipus complex are most important in developing the male infantile super-ego. Therefore, the satisfactory parental handling and resolution of the Electra complex are most important in developing the female infantile super-ego , because, by identifying with a parent, the girl internalizes morality ; thereby, she chooses to comply with societal rules, rather than reflexively complying in fear of punishment. Background[ edit ] The psychologist Sigmund Freud at age 16 with his mother in In his book The Interpretation of Dreams first published in , he proposed that an Oedipal desire is a universal, psychological phenomenon innate phylogenetic to human beings, and the cause of much unconscious guilt.