Freud believed that the desire for incest and a wish to kill same sex parent were associated with a universal stage in childhood development.
Problems arise because same sex parent is loved, detested, and feared, simultaneously.
Freud linked totemism, a widespread belief that human clans are descended from animals,who became their special protectors, to childhood animal phobias, in which, he believed, ambivalent feelings about same sex parent were displaced onto animals. Freud believed that totemic beliefs were usually linked to a ritual killing and eating of the totemic animal, but that killing of totemic animals was forbidden at other times. This is not, in fact, universal in societies with totemic beliefs. Freud believed that totemism had arisen at a time in the distant past, when humans lived in hordes, ruled over by senior males, who monopolized the females. He got this idea from Atkinson, a disciple of Charles Darwin.