Tenn. Code Ann. § 36-4-112: Defense when ground is adultery

If the cause assigned for the divorce is adultery, it is a good defense and perpetual bar to the same if the defendant alleges and proves that:

(1) The complainant has been guilty of like act or crime;

(2) The complainant has admitted the defendant into conjugal society and embraces after knowledge of the criminal act;

(3) The complainant, if the husband, allowed the wife's prostitutions and received hire for them; or

(4) The husband exposed the wife to lewd company, whereby the wife became ensnared to the act or crime of adultery.