I think the answer can be found in the writings of the chairwoman of the Theosophical Movement in the UK, Dr Annie Besant, who declares in her book The Life and Teachings of Muhammad, that pretended monogamy in the west is like polygamy without responsibility because the mistress is cast off when the man is weary of her. I fully agree to her pointing out that monogamy with a blended mass of prostitution is hypocrisy and more degrading than a limited polygamy.
Women living in monogamy are not protected fully because men often enjoy extramarital affairs without obligatory economic consequences, and thus he can ‘play around’ without taking responsibility for his sexual conduct. Birth control and the ease of abortion have opened sex for fun to western women but she is still the one who suffers the trauma of abortion and the side effects of birth control methods, often left alone by the man with whom she has had intimate relations. If the man has numerous mistresses and illegitimate children, his relationship is left unpunished in many countries. Polygamy, on the other hand, means protection for women united to one man, with a legitimate child in her arms and surrounded with respect, contrary to being seduced and then cast out into the streets perhaps with illegitimate children outside the rule of law.

read more HERE AT THE SOURCE:  http://www.dailytimes.com.pk/opinion/15-Feb-2014/polygamy-in-pakistan