A proposed law in San Francisco would require the city's nudists to cover public seats with a protective barrier before sitting down. Supervisor Scott Wiener, who introduced the bill, claims that sharing bus seats, cafe benches, and restaurant chairs with naked people is a threat to public health. It's a claim that's been repeated in city ordinances and even a Supreme Court case. Does public nudity really increase the spread of infectious diseases?

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That the wrong question. The correct question is why are they letting people go naked in the first place.