An informative article on nocturnal activities in Turkey including Istanbul discos and adult nightlife as Turkey has thriving red light districts, where Genelev (local term for brothels) operate legally under the control of the municipality. However, only Turkish nationals are admitted into Turkish red-light districts. Foreigners - including passport holders of European Union member states - are discriminated against in Genelev standard houses and not welcome.
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An older article about issues of prostitutes in Turkey. There is another resource dealing with Turkish prostitution laws in the country. Maybe a bit outdated, now. Genelev Karaköy is a place with Police controlling customers of brothels for legal age. Only Turkish citizens may visit prostitutes in Turkey at this time.