The Chinese have given a beautiful and very convincing theory as to why the wedding ring should go on the fourth finger:
Look at your left hand, the hand that your wedding ring goes on, and do you see your thumb? Well the thumb represents your parents. Now your index finger, or your first finger, represents your siblings. The third finger, referred to as the middle finger by some, represents you. The fourth finger represents your life partner. Your pinkie represents the children you will some day have.
Now if you place both of your hands together. Bend your middle fingers together and leave the other fingers touching together (like shown in the picture).
When your hands are in the correct position, pull your thumbs apart (your parents). Your thumbs will open because you and your parents are not destined to be together forever. At some point they will leave you in your life. Now put your thumbs back together.
Repeat the same motion with your index fingers (your siblings). Your index fingers will also separate because you are also not destined to live under the same roof or area with your siblings for the rest of your life. They will move on and have families of their own. Now put them back together.
Now separate your pinkies (your future children). They too will also separate because your children will not be with you forever. They will grow up to have lives and families of their own as well. Now put them back together.
Now it comes down to your “ring” finger (your life partner). Try separating them as you did with the others. Can’t do it can you? That is because your life partner become connected and one in marriage. They are the one who’s is to be faithful in loving you and vice versa for the rest of your life.
How cool is that?!