Less canonically, “natural marriage” is also at times used as a rough synonym for “common-law marriage.”
common-law marriage is a response to invasion of privacy by the government.
common-law marriage is an act of protest against a corrupt system of religious marriage and divorce in Israel.
A legal marriage brought about by the cohabitation of a man and a woman, or by their agreement to consider themselves married, rather than by a wedding. (See common law.)