SAN FRANCISCO (AP) -- Nudists in San Francisco might soon lose the freedom to bare it all - at least some of the time.

Walking around naked is legal, but a city supervisor concerned about public health and sanitation introduced legislation Tuesday that would require nudists to put something under their bottoms if they take a seat in public.

Supervisor Scott Wiener's proposal would also require nudists to cover up when they are in a restaurant.

Wiener represents the city's Castro District, where a group of nudists is known to gather and walk around. He tells the San Francisco Chronicle (http://bit.ly/rao7dr ) he only wants to require that nudists show basic courtesy and decency to their fellow citizens, not open up a debate on the appropriateness of public nudity.

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Information from: San Francisco Chronicle, http://www.sfgate.com