San Francisco likes to think of itself as the most liberal US city. Every May, for example, the famous Bay to Breakers race takes place.
Many participants run the 7.5 mile course in fancy dress, but there is also an unofficial nude category, which has made the race more of a tourist attraction than it might otherwise be.
Still, at least the nudists tend to run in a conventional direction. Marching backwards up the street is something new.
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