(a) A person is guilty of a sexual offense in the first degree if the person engages in a sexual act:
(1) 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; or
(2) With another person by force and against the will of the other person, and:
a. Employs or displays a dangerous or deadly weapon or an article which the other person reasonably believes to be a dangerous or deadly weapon; or
b. Inflicts serious personal injury upon the victim or another person; or
c. The person commits the offense aided and abetted by one or more other persons.
(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. 106, ss. 3, 4; 1983, c. 175, ss. 5, 10; c. 720, s. 4; 1994, Ex. Sess., c. 22, s. 3.)