The whole history of the development of mankind suggests that a man is polygamous. None of the Divine Scriptures says otherwise, does not directly indicate that exclusively monogamous marriage is allowed. These statements grew later, when local beliefs or some traditions were superimposed on the religious basis. Moreover, artificial monogamous marriages and the ban on divorce brought turmoil into the world - the institution of prostitution, the system of mistresses, the problems of civil marriages and free love. Islam, being the most gentle and flexible religion, taking into account both the interests of a "polygamous" man and the woman's right to family stability, limited the possible simultaneous number of wives. What does Islamic law say about this issue? A man, indeed, has the right to marry more than one wife, but their total simultaneous number is limited to four. The reasons that prompt a man to remarry can be different, for example: infertility or inability of the first wife to bear children; ￼the conditions of the war or post-war period, when the number of unmarried women and widows (in need of arranging a family hearth, care and attention) exceeds the number of men; ￼physiological characteristics of a man, expressed in excessive sexual activity (provided that two or more families are sufficiently provided for materially), which can create grounds for adultery, which is a great sin before the Almighty and the family. A man who has married more than one should treat all his wives equally and fairly. The conclusion from the above is unequivocal: the second, and even more so the third and fourth, family is permission ("mubah") under certain circumstances and requires some sacrifices in order to exist in the optimal variant for everyone, without harming anyone.