When the wise Sharee’ah deemed polyandry allowable, it enjoined the Muslim woman to treat her husbands on a footing of equality. The Quran allows women to marry as many husbands as they like, as long as they give themselves willingly, saying that married women are forbidden to men unless they choose to give themselves freely to a second, third, fourth, fifth…husband: “except those your right hands possess [This is] the decree of Allah upon you.”
In fact, there is no condition set by the Quran for the Muslim woman who chooses to practice polyandry. We know of no evidence suggesting that Islamic Sharee’ah obliges the wife to inform her first husband of her intention to have a second husband. Please refer to Fatwa 86395.
Refraining from informing the husband of the second marriage does not constitute deception on the part of the wife. She is entitled to marry another husband as per the Quran. In most cases, the greater interest entails that the wife does not inform the first husband of her intention to remarry so as not to hurt him and to spare him the unfavorable feelings of distress. This matter does not involve any tampering with the first husband’s feelings.
In fact, polyandry abounds in many benefits that should not be missed merely because of a given husband’s refusal or aversion towards the idea. A man is naturally averse to polyandry; however, it is not wise to let the husband’s innate aversion towards having co-husbands deny the wife the benefits of polyandry. For more benefit, please refer to Fataawa 86818 and 90132.
However, a Muslim husband should see this experience as any affliction that may befall him. If he is patient, this will be a cause for the raising of his rank and atonement of his sins. Please refer to Fatwa 83577 about the merits of patience.
If the wife informs her husband of her second marriage or he finds out about of it, it is not permissible for him to seek divorce merely because his wife has another husband. In stead, he should thank Allah for still allowing him to have a part of his wife. He should also put his heart and soul into serving his wife, pleasing and obeying his wife in every way, and giving his wife complete sexual satisfaction so as to keep his wife’s love, and make himself worthy of her protection.
And Allah knows best.