The first sex constraint of human society

The first constraint of human society is to prohibit incest, the father and daughter, mother and child, between brothers and sisters having sex is strictly prohibited. In some cultures, but also to further expand to prohibit all sexual relations between close relatives.


A primitive tribal groups, usually only a dozen members of the tribe within the family caused by inbreeding within the marriage will cause the gradual degradation of physical and health conditions are getting worse by generation, and inter-tribal marriage is to produce strong offspring. Primitive people living in the generation of re-generation of the practice of recognized that inbreeding will produce weak offspring, so marriage within the clan within the tribe gradually inter-tribal marriage outside the clan the development of gender behavior within the family became incest banned. Of human sexuality began to receive social constraints to ensure that the original human move toward a civilized society. This alone, we must not underestimate constraint for the importance of human society.

The first constraint will be the form of religious taboos, since primitive man could not have known genetic principles, they will produce an unhealthy marriage within the clan as a divine punishment for future generations, so prohibition of incest is God's will can not be disobeyed. This, in essence formed a man's first sexual morality.

Marriage within the clan to the tribe from outside the marriage is a big step forward, but still group marriage, children only have a mother, not knowing his father, sexual intercourse may also occur between close relatives, eugenics also not be guaranteed. When the matriarchal society of the dual marriage occurs, eugenics Youxiang a step forward, but still may be half of the offspring of incest between close relatives, because then the dual marriage is relatively stable relationship is not solid, so the same father the children they can not identify the half-blood relationships. Strictly monogamous patriarchal society until the emergence of not only direct blood may not incest, and even third-generation or fifth generation collateral can not be marriage customs, sexual mores during the formation of human eugenic side is firmly guaranteed.

When the modern genetic theory, illustrates the nature of eugenics, the human only to turn around and recognize the institution of marriage on the development in the evolution of human physical significance, which proved that the formation of sexual morality appears constraint is a necessary condition for human survival and development of .