Laws differ between states and countries in what content they may be contained and the conditions and circumstances under which a marriage contract may be declared unenforceable, for example. B a contract signed under fraud, coercion or without adequate disclosure of assets. A marriage contract, marriage contract or pre-marital contract (commonly known as Prenup) is a written contract entered into by a couple before marriage or a registered partnership that allows them to choose and control many of the legal rights acquired during marriage, and what happens when their marriage ends in death or divorce. .