ومن الطباع ما تغلب عليها الشهوة بحيث لا تحصنه المرأة الواحدة فيستحب لصاحبها الزيادة على الواحدة إلى الأربع فإن يسر الله له مودة ورحمة واطمأن قلبه بهن وإلا فيستحب له الإستبدال
إحياء علوم الدين للغزالي كتاب آداب النكاح الباب الأول في الترغيب في النكاح والترغيب عنه
For someone whose disposition is so overcome by sex drive that one woman alone can not safeguard him, it is desirable for him to have additional companions to the one, up to four. For indeed Allah will satisfy him with affection and mercy and will give peaceful assurance to his heart from them; otherwise it is desirable that he replace them.
Al-Ghazali, Ihyaa ‘Ulum Al-deen [Revival of the Religious Sciences], The book of manners in marital relations, Section one: concerning awakening of desire for marital relations and turning away from them