Some cities have also law that forbids prostitution on any other areas of the city than red-light areas. Usually the official RLDs have legal prostitution and unofficial RLDs have illegal prostitution.
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Wiki Sex Guide has listed the red-light districts in each city.
These kind of areas are also called as "tolerance zones".
Wiki Sex Guide advises where to find sex, prostitution, escorts, red-light districts, prostitutes, sex workers, street hookers, escort agencies, erotic massage parlors, brothels, sex clubs, strip clubs, striptease, KTVs, swinger clubs, BDSM clubs, sex shops, adult theaters, love hotels, short-time hotels, nightclubs, bars, gay action, lesbian action, dating, transsexuals, sexual services for women, girl-friendly hotels and how to stay safe and avoid common scams in each location.
Wiki Sex Guide tells you the most important things what you should know about that location you're visiting.