Incest (n.) is dreamt by many men, who report it with indignation and astonishment — and Jocasta already told Oedipus that many a man had dreamed it.
Incest (n.) is a wish born afresh with every child, along with cannibalism and lust for killing — the oldest privations, still the kernel of hostility to civilization.
Incest (n.) is what the poorest naked cannibals, otherwise unbound by our morality, guard against with the most scrupulous care and the most painful severity.
Incest (n.) as a wish is repressed into the unconscious by us and still treated by savages as an immediate peril requiring the severest defence.
Incest (n.) is forbidden to mortals and freely allowed to gods, and sister-marriage was a sacred duty of Pharaohs and Incas — a privilege kept from the common herd.
Incest (n.) is a primordial human wish never fully overcome, which is why myth and royal genealogies still granted it to gods and kings.
Incest (n.) horror is not natural feeling: Pharaohs married their sisters as a sacred custom, gods and heroes did it freely, and Europe's crowned heads are in effect one family.
Incest (n.) taboo is the murdered father's will continued after his death — hence its fierce feeling and its lack of any rational reason: in short, its sacredness.