(a) Rape of a person who is the spouse of the perpetrator is an act of sexual intercourse accomplished under any of the following circumstances:
(1) Where it is accomplished against a person's will by means of force, violence, duress, menace, or fear of immediate and unlawful bodily injury on the person or another.
(2) Where a person is prevented from resisting by any intoxicating or anesthetic substance, or any controlled substance, and this condition was known, or reasonably should have been known, by the accused.
(3) Where a person is at the time unconscious of the nature of the act, and this is known to the accused. As used in this paragraph, "unconscious of the nature of the act" means incapable of resisting because the victim meets one of the following conditions:
(A) Was unconscious or asleep.
(B) Was not aware, knowing, perceiving, or cognizant that the act occurred.
(C) Was not aware, knowing, perceiving, or cognizant of the essential characteristics of the act due to the perpetrator's fraud in fact.