 Legal prostitution within the city requires sex workers to obtain a permit and be subjected to monthly health checkups.Brothels in Tijuana, many of them modeled on strip clubs and hostess clubs, must also conform to certain health regulations, such as standards of cleanliness, fixed operating hours, and be placed a regulated distance from schools or day care centers.In addition to established brothels, there are prostitutes who work outside on the "callejones" or alleys and are referred to as "paraditas", Spanish for "the standing girls", for their practice of standing on the street to advertise their services.