In the Catholic Church, a couple can petition for a Declaration of Nullity (also known as an annulment) for a four specific reasons: ∘ Defect of Form: If the marriage ceremony is invalid (i.e., the couple were married outside of the Catholic Church). ∘ Defect of Capacity: I.e., certain blood relationships that would constitute incest. Also, if either party were married to another and thus unable to enter into a valid contract. ∘ Defect of Will: I.e., because of "mental incapacity, ignorance, error about the person, error about marriage, fraud, knowledge of nullity, simulation, conditioned consent, force or grave fear". Or... ∘ Defect of Contract: If the marriage was not contracted in good faith. For example if there was hidden intent on either side or if either party lacked the intent to enter into a lifelong, exclusive union, open to reproduction. Yeah, IOW "irreconcilable differences". That's called a divorce, people...
