And also married women, except for those you have taken in war as slaves. This is what Allah has prescribed for you. Apart from that He has made all other women halal for you provided you seek them with your wealth in marriage and not in fornication. When you consummate your marriage with them give them their prescribed dowry. There is nothing wrong in any further agreement you might come to after the dowry has been given. Allah is All-Knowing, All-Wise.