(1) he is legally married and he:

(A) purports to marry or does marry a person other than his spouse in this state, or any other state or foreign country, under circumstances that would, but for the actor's prior marriage, constitute a marriage; or

(B) lives with a person other than his spouse in this state under the appearance of being married; or

(2) he knows that a married person other than his spouse is married and he:

(A) purports to marry or does marry that person in this state, or any other state or foreign country, under circumstances that would, but for the person's prior marriage, constitute a marriage; or

(B) lives with that person in this state under the appearance of being married.

(b) For purposes of this section, "under the appearance of being married" means holding out that the parties are married with cohabitation and an intent to be married by either party.

(c) It is a defense to prosecution under Subsection (a)(1) that the actor reasonably believed that his marriage was void or had been dissolved by death, divorce, or annulment.

(d) For the purposes of this section, the lawful wife or husband of the actor may testify both for or against the actor concerning proof of the original marriage.

(e) An offense under this section is a Class A misdemeanor.