Cal. Penal Code § 318.5

(a) Nothing in this code shall invalidate an ordinance of, or be construed to prohibit the adoption of an ordinance by, a county or city, if that ordinance directly regulates the exposure of the genitals or buttocks of any person, or the breasts of any female person, who acts as a waiter, waitress, or entertainer, whether or not the owner of the establishment in which the activity is performed employs or pays any compensation to that person to perform the activity, in an adult or sexually oriented business. For purposes of this section, an “adult or sexually oriented business” includes any establishment that regularly features live performances which are distinguished or characterized by an emphasis on the exposure of the genitals or buttocks of any person, or the breasts of any female person, or specified sexual activities that involve the exposure of the genitals or buttocks of any person, or the breasts of any female person.
(b) The provisions of this section shall not be construed to apply to any adult or sexually oriented business, as defined herein, that has been adjudicated by a court of competent jurisdiction to be, or by action of a local body such as issuance of an adult entertainment establishment license or permit allowing the business to operate on or before July 1, 1998, as, a theater, concert hall, or similar establishment primarily devoted to theatrical performances for purposes of this section.
This section shall be known and may be cited as the “Quimby-Walsh Act.”