(a) It shall be unlawful for any person to knowingly:

(1) Photograph himself or any other person, for purposes of preparing an obscene film, photograph, negative, slide or motion picture for purposes of sale or distribution; or

(2) Model, pose, act or otherwise assist in the preparation of any obscene film, photograph, negative, slide or motion picture for purposes of sale or distribution.

(b) Any violation of this section shall constitute a Class 3 misdemeanor.