(a) A person commits the crime of sodomy in the second degree if:
(1) He, being 16 years old or older, engages in deviate sexual intercourse with another person less than 16 and more than 12 years old.
(2) He engages in deviate sexual intercourse with a person who is incapable of consent by reason of being mentally defective.
(b) Sodomy in the second degree is a Class B felony . (Acts 1977, No. 607, p.812 § 2316; Acts 1979, No. 79-471, p.862, § 1; Acts 1987, No. 87-607, p.1056, §3.)