Alienation of Affection is a legal term for convincing one spouse to leave the other spouse for a lover. The damages resulting from Alienation of Affection are those resulting from the loss of conjugal relations. The lawsuit is brought against the lover and not the spouse. Hawaii, Illinois, North Carolina, Mississippi, New Mexico, South Dakota, and Utah are the only states that still recognize it as a cause of action as of the date of this post.
See my other post on Alienation of Affection about a lady who obtained a judgment for $500,000 against her husband's mistress.