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Rh meant to do what they have actually accomplished. “In no other way does it seem possible to explain in all its details a system at once so complex and so regular.”

It is of interest to point out that the first restrictions which the introduction of marriage classes brought about affected the sexual freedom of the younger generation, in other words, incest between brothers and sisters and between sons and mothers, while incest between father and daughter was only abrogated by more sweeping measures.

However, to trace back exogamous sexual restrictions to legal intentions does not add anything to the understanding of the motive which created these institutions. From what source, in the final analysis, springs the dread of incest which must be recognized as the root of exogamy? It evidently does not suffice to appeal to an instinctive aversion against sexual intercourse with blood relatives, that is to say, to the fact of incest dread, in order to explain the dread of incest, if social experience shows that, in spite of this instinct, incest is not a rare occurrence even in our society, and if the experience of history can acquaint us with cases in which incestuous marriage of privileged persons was made the rule.