Why should the wedding ring be worn on the fourth finger?

There is a beautiful and convincing explanation. Thumb represents your -- Parents Second (Index) finger represents your Siblings Middle finger represents your Self Fourth (Ring) finger represents your Life Partner & Last (Little) finger represents your Children

Note:

Anthropology

1. The scientific study of the origin, the behavior, and the physical, social, and cultural development of humans.

2. That part of Christian theology concerning the genesis, nature, and future of humans, especially as contrasted with the nature of God.