Marriage, public policy, validity–marriage licenses, issued, when
1. It is the public policy of this state to recognize marriage only between a man and a woman.
2. Any purported marriage not between a man and a woman is invalid.
3. No recorder shall issue a marriage license, except to a man and a woman.
4. A marriage between persons of the same sex will not be recognized for any purpose in this state even when valid where contracted.
(Missouri Ann. Statutes section 451.022)
Only marriage between a man and a woman recognized as valid
That to be valid and recognized in this state, a marriage shall exist only between a man and a woman.
(Missouri Constitution, Article 1, Section 33, approved by the electorate on August 3, 2004)
Currently no applicable litigation