(a) A person commits the crime of sexual abuse in the first degree if:
(1) He subjects another person to sexual contact by forcible compulsion; or
(2) He subjects another person to sexual contact who is incapable of consent by reason of being physically helpless or mentally incapacitated; or
(3) He, being 16 years old or older, subjects another person to sexual contact who is less than 12 years old.
(b) Sexual abuse in the first degree is a Class C felony.