If it (sex) is done wholeheartedly, in a friendly and loving manner, with full desire and with the intention of reward only than one can get complete pleasure which no other thing can give. It can only be attained by doing it in a best way. The sign of it is, after doing it every part of the body feels calm, eyes feel cool by seeing the beloved (wife), and the ears feels happiness by listening to her soft and beautiful voice, Through her perfume and by touching her it feels good, and by kissing her the taste of mouth changes, likewise every part of the body feels good..
Because women (wives) are the cause of happiness of the heart that is why they are also called the reason to the happiness of the soul. Allah says “And of His signs is that He created for you from yourselves mates that you may find tranquillity in them” [30:21]