Section — Sabetti-Barrett, Compendium of Moral Theology

§ II. On Adultery

291.
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Adultery is copulation with the spouse of another, or is access to a bed not one's own.

292.
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I say 1st. Adultery, besides a sin against chastity, includes another against justice, which by its own nature is mortal, because it contains a violation of strict right gravely obliging. Indeed, if it is had between two married persons, a double adultery is committed, because the diverse rights of two persons are injured.

I say 2nd. Adultery is committed even if the other spouse consents; because in every case the rights of the sacrament and of the indissoluble contract are violated, which rights nature itself requires, and are altogether inalienable.