The loan is approved thanks to your impeccable credit score and 10% down. Suppose you apply for a mortgage with the best of intentions. To better understand this, let’s start with a simpler contract. Or even the institution of marriage! Unless one party poses a significant flight risk, why would willing participants need a legal contract to compel each other to stay? Why do they need a contract? Don’t they trust each other? And if they don’t trust each other, why don’t they walk away? Two adults are about to engage in sexual relations.