Psychologists tell us that children who do not know their parents, especially their father undergo severe mental trauma and disturbances. Often they have an unhappy childhood. It is for this reason that the children of prostitutes do not have a healthy childhood. I am aware that recent advances in science have made it possible for both the mother and father to be identified with the help of genetic testing. Thus this point was applicable for the past, and may not be applicable for the present.
Man is more polygamous by nature as compared to a woman.
Biologically, it is easier for a man to perform his duties as a husband despite having several wives. A woman, in a similar position, having several husbands, will not find it possible to perform her duties as a wife. A woman who has more than one husband will have several sexual partners at the same time and has a high chance of acquiring venereal or sexually transmitted diseases which can also be transmitted back to her husband even if all of them have no extra-marital sex. This is less likely in a man having more than one sexual partner, and none of them having extra-marital sex. The above reasons are those that one can easily identify.