A person is guilty of sexual abuse in the first degree when he or she subjects another person to sexual contact:
1. By forcible compulsion; or
2. When the other person is incapable of consent by reason of being physically helpless; or
3. When the other person is less than eleven years old; or
4. When the other person is less than thirteen years old and the actor is twenty-one years old or older.
Sexual abuse in the first degree is a class D felony.