(a) It is a defense to prosecution for violation of this Chapter that a person appearing in a state of nudity did so in a modeling class operated:
(1) By a college, junior college, or university supported in whole or in part by taxation;
(2) By a private college or university which maintains and operates educational programs in which credits are transferrable to a college, junior college, or university supported entirely or partly by taxation; or
(3) In a structure:
(A) Which has no sign visible from the exterior of the structure and no other advertising that indicates a nude person is available for viewing; and
(B) Where, in order to participate in a class a student must enroll at least three (3) days in advance of the class; and
(C) Where no more than one nude model is permitted at a time.
(b) It is a defense to prosecution for violation of this Chapter that an employee of a sexually oriented business exposed any specified anatomical area during the bona fide use of a restroom or dressing room accessible only to employees.