Activity as distinguished from aggression derives from self-preservative instincts and is directed (with subjective aggression) against prey used as food. There is devouring oral aggressive energy. It is not directed against one's own species. In man these oral archaic energies, under primary repression, emerge as sublimations. But the aggression deriving from the sexual instinct is heavily colored with rivalry and the consequences of frustration. Thus in sibling relationships there is rivalry for love and food; in respect to parents there is frustration aggression, and ultimately, sexual rivalry. These two forms of aggression ('activity' and 'frustration aggression') differ genetically but are closely related.