﴿ ۞ وَٱلْمُحْصَنَٰتُ مِنَ ٱلنِّسَآءِ إِلَّا مَا مَلَكَتْ أَيْمَٰنُكُمْ ۖ كِتَٰبَ ٱللَّهِ عَلَيْكُمْ ۚ وَأُحِلَّ لَكُم مَّا وَرَآءَ ذَٰلِكُمْ أَن تَبْتَغُوا۟ بِأَمْوَٰلِكُم مُّحْصِنِينَ غَيْرَ مُسَٰفِحِينَ ۚ فَمَا ٱسْتَمْتَعْتُم بِهِۦ مِنْهُنَّ فَـَٔاتُوهُنَّ أُجُورَهُنَّ فَرِيضَةًۭ ۚ وَلَا جُنَاحَ عَلَيْكُمْ فِيمَا تَرَٰضَيْتُم بِهِۦ مِنۢ بَعْدِ ٱلْفَرِيضَةِ ۚ إِنَّ ٱللَّهَ كَانَ عَلِيمًا حَكِيمًۭا ﴾

“And [forbidden to you are] all married women other than those whom you rightfully possess [through wedlock]: this is God's ordinance, binding upon you. But lawful to you are all [women] beyond these, for you to seek out, offering them of your possessions, taking them in honest wedlock, and not in fornication. And unto those with whom you desire to enjoy marriage, you shall give the dowers due to them; but you will incur no sin if, after [having agreed upon] this lawful due, you freely agree with one another upon anything [else]: behold, God is indeed all-knowing, wise.”

Many natural desires make themselves felt in human beings—sexuality between man and woman being one of these. Islamic law, which fixes a limitation for all human emotions, has determined the limits for sexual relationships also. According to this divine dictate, only that sexual alliance between man and woman is valid which is established through a standard solemn social agreement in the form of marriage. It requires, moreover, that along with the satisfaction of natural desire, an environment of chastity must also prevail in the family life. For this purpose certain close relations have been declared prohibited to keep them beyond and above sexual desires.