In my post ,Manifesto: The Primal Creation, I suggested that the one-flesh marriage relationship is foundation to all other relationships and communities, and that it was not a human construct.  Here is an enlightening essay by Adam J. MacLeod along similar lines.

“The rights and duties of marriage and biological parentage (to which Kent added sanctity of conscience) are even more directly fundamental than civil rights. They are among those divine and natural rights and duties that positive law merely recognizes, does not create, and may not alter.”

There Is a Fundamental Right to Marriage, and We Must Preserve It.