Man is a most contradictory creature in the world. An animal with this much internal conflict has not existed on this earth.Man shares a lot of traits with the chimpanzee except the inner contradictions .
Infanticide played a very important role in human evolution.The family evolved primarily because of the need to protect children.Humans became easy prey to predators when they shifted from the forest to the savannahs, which deprived them of the option of climbing trees to flee predators.Only because of this protection were women able to give birth in shorter intervals than apes. This rapid reproduction is one of the reasons why humans dominate the world , not the apes.
Chastity of women is important in the family system because man does not end up protecting somebody else’s child.