As recently as the seventeenth century, polygamy was practiced and accepted by the Christian Church. Monogamy was introduced into Christianity at the time of Paul when many revisions took place in Christianity. In the American society many times when relations are strained, the husband simply deserts his wife. The he cohabits with a prostitute or other immoral woman without marriage. Islam condones but discourages the first and forbids the other two.
Wars cause the number of women to greatly exceed the number of men.
In a monogamous society these women, left without husbands or support, resort to prostitution, illicit relationships with married men resulting in illegitimate children with no responsibility on the part of the father, or lonely sisterhood or widowhood. Easy birth control and easy legal abortion has opened the door of illicit sex to woman and she has been lured into the so-called sexual revolution. But she is still the one who suffers the trauma of abortion and the side effects of the birth control methods. Taking aside the plagues of venereal disease, herpes and AIDS, the male continues to enjoy himself free of worry. Men are the ones protected by monogamy while women continue to be victims of men's desires.