Indiana Code Title 35. Criminal Law and Procedure § 35-42-4-1

(1) the other person is compelled by force or imminent threat of force;

(2) the other person is unaware that the sexual intercourse or other sexual conduct (as defined in IC 35-31.5-2-221.5) is occurring;  or

(3) the other person is so mentally disabled or deficient that consent to sexual intercourse or other sexual conduct (as defined in IC 35-31.5-2-221.5) cannot be given;

(1) it is committed by using or threatening the use of deadly force;

(2) it is committed while armed with a deadly weapon;

(3) it results in serious bodily injury to a person other than a defendant;  or

(4) the commission of the offense is facilitated by furnishing the victim, without the victim's knowledge, with a drug (as defined in IC 16-42-19-2(1)) or a controlled substance (as defined in IC 35-48-1-9) or knowing that the victim was furnished with the drug or controlled substance without the victim's knowledge.