Sec. 11.41.432. - Defenses.
(a) It is a defense to a crime charged under AS 11.41.410 (a)(3), 11.41.420(a)(2), 11.41.420(a)(3), or 11.41.425 that the offender is
(1) mentally incapable; or
(2) married to the person and neither party has filed with the court for a separation, divorce, or dissolution of the marriage.
(b) Except as provided in (a) of this section, in a prosecution under AS 11.41.410 or 11.41.420, it is not a defense that the victim was, at the time of the alleged offense, the legal spouse of the defendant.