So Freud's theory is always at least a dualistic theory involving internal conflict. He thought 'monocausal' theories miss something about the contradictory nature of human beings. Freud's theory of the Oedipus Complex is a theory of such conflict stemming from our early relationships to parents and siblings. The Oedipus Complex is not a theory about 'sexuality', but a theory about sensuous-emotional relationships . Love and jealousy, rivalry and dependence are all mixed up together, directed to parents or their substitutes.
Ambivalence is the order of the day.
Not so much a story of 'sex' as an unavoidable psycho-drama with an infinite capacity for disguise and variation. But there is one indissoluble link in Freud's sexual theories which may give us some hint as to why they have proved to be so disturbing. That is the intimate association between sexuality and anxiety. At first Freud thought that anxiety was caused if sexuality did not have an adequate outlet, as if some noxious hormonal substance built up in the body and poisoned it. Then he thought that anxiety was caused by repression of the sexual instinct.