[Fido]

No! But, the primary morality to all people, the incest taboo, was to a people not advanced in biology, an evidence of the spiritual power that can be concieved of out of physical evidence. Just as they seemed to think that deer must talk because they are intelligent and warry, they also believed there was an actual curse attached to incest since it soon brought forth monsters. Look at the story of Oedipus who brought down a curse upon his home as tyrant/king for doing that which even cattle do not do.