(a)        A person is guilty of first-degree statutory sexual offense if the person engages in a sexual act with a victim who is a child under the age of 13 years and the defendant is at least 12 years old and is at least four years older than the victim.

(b)        Any person who commits an offense defined in this section is guilty of a Class B1 felony. ?(1979, c. 682, s. 1; 1979, 2nd Sess., c. 1316, s. 6; 1981, c. 63; c. 106, ss. 3, 4; c. 179, s. 14; 1983, c. 175, ss. 5, 10; c. 720, s. 4; 1994, Ex. Sess., c. 22, s. 3; 2015-181, s. 11.)