A red-light district is a part of an urban area where there is a concentration of prostitution and sex-oriented businesses, such as sex shops, strip clubs, adult theaters, etc. The term originates from the red lights that were used as signs of brothels.
There are areas in many big cities around the world which have acquired an international reputation as red-light districts.

Apocryphal information exists indicating that the red light was used inside the bedchambers of brothels to obscure and conceal from patrons the red blemishes of various venereal diseases upon the skin of the prostitutes.
The red light seen from outside through the curtains became known as a sign of the activities within.

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