CAL. PEN. CODE § 653.20 : California Code - Section 653.20

For purposes of this chapter, the following definitions apply:

(a) "Commit prostitution" means to engage in sexual conduct for money or other consideration, but does not include sexual conduct engaged in as a part of any stage performance, play, or other entertainment open to the public.

(b) "Public place" means an area open to the public, or an alley, plaza, park, driveway, or parking lot, or an automobile, whether moving or not, or a building open to the general public, including one which serves food or drink, or provides entertainment, or the doorways and entrances to a building or dwelling, or the grounds enclosing a building or dwelling.

(c) "Loiter" means to delay or linger without a lawful purpose for being on the property and for the purpose of committing a crime as opportunity may be discovered.