According to Polaris Project, there are over 525 massage parlors that acts as fronts for the prostitution industry in the US state of New Jersey.
(Reported prices of prostitutes worldwide.)
Source: Jillian Riseberg, “New Jersey a hub for human trafficking and sex trade,” New Jersey Newsroom, May 9, 2011.

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Massage parlors do not disturb those who do not engage. It is unfortunate that those who enter the world of the spa-goer become habituated and unfortunately sometimes infected with blood-borne, or skin conditions which are a nusiance. They should be shut down as they are detrimental to the consumer of spa services.