Some good marriage and relationship metaphors are: A marriage is a good red wine. It gets better with age. A strong marriage is the cornerstone of a family.
A relationship metaphor is an expression in which a personal relationship, or some associated experience or emotion, serves as the tenor. Metaphors, including relationship metaphors, function as important mechanisms for the expression of experience and emotion.
What describes a marriage?
A commonly accepted and encompassing definition of marriage is the following: a formal union and social and legal contract between two individuals that unites their lives legally, economically, and emotionally. Being married also gives legitimacy to sexual relations within the marriage.