3. You are happy
Books distract you from your daily routine, stress and tension. It is easier to forget problems when you have an interesting book at home. Read as many books as possible together with your partner and you will feel happy and more carefree. It is great that there is such an effective and cheap way to decrease psychological tension. 

4. You can discover
Books are exciting. If you read the same book together you experience something nice simultaneously. Both of you find out something new. Couples who spend time reading books broaden their horizons by learning something new from books. It’s a wonderful activity for both of you.