8 Things to Strengthen the Husband-Wife Relationship. According to the Quran, the purpose of marriage is to attain sukun (tranquility and peace), which can never be achieved through impulsive sexual fulfillment unless it is accompanied by mutual love, affection, caring, and sharing, which are all part and parcel of a fulfilling and productive marriage relationship. Islam, as we know it holistically from the sources, is a balanced way of looking at things.