Why wedding ring worn on fourth finger?

Have you ever wonder why married couples worn wedding rings on their forth finger or ring finger? There was a nice Chinese explanation regarding it. Below are fingers representation:

• Thumb represents your parents
• Index finger represents your siblings
• Middle finger represents your self
• Ring finger represents your life partner
• Little finger represents children

Now, put your palms together and bend both of your middle fingers. Hold middle fingers back-to-back and hold all other four fingers tip-to-tip.

Now, if you try to separate your thumbs which represents your parents, you can! According to the Chinese, this is because your parents are not destined to live with you forever. You can also open your index finger because your sibling which is your brothers and/or sisters are going to left you to have there separate life or maybe build their own family. You can also open your little finger that represents your children. Your children will also be building their own separate lives and settle themselves someday with a family of their own.

Finally, try to separate your ring finger. You can't since as a husband and wife, you are destined to be together for better, for worse, for richer, for poorer, in sickness or in health, to love and to cherish 'till death separate you both.

Below is a video I saw on youtube that enlighten me why do husband and wife wear wedding rings on their forth finger.