There is a beautiful & convincing explanation given by the Chinese as to why wedding rings are worn on the fourth finger. Each finger represents a relationship.
Thumb: your parents
Second (index) finger: your siblings
Middle finger: yourself
Fourth (ring) finger: your life partner
Last (little) finger: your children
1st: open your hands (palm to palm), bend the middle fingers & hold them together-back to back. 2nd: open & hold the remaining 3 fingers & the thumb - tip to tip.
Now, try to separate your thumbs (representing the parents). They will open because your parents are not destined to live with you lifelong & will leave you sooner or later.
Join your thumbs as before & separate your index fingers (representing your siblings). They will also open because your brothers & sisters will have their own families & will lead their own separate lives.
Now, join the index fingers & separate your little fingers (representing your children). They will open too because the children will get married & settle down on their own some day.
Finally, join your little fingers & try to separate your ring fijngers (representing your spouse). You will be surprised to see that you cannot because husband & wife have to remain together all their lives - through thick & thin!
"For the woman which hat an husband is bound by the law to her husband as long as he liveth." Romans 7:2