It is not illegal to be nude in San Francisco, in fact, the city claims it is okay to be naked. A proposed law may mean that nudists will have to carry a towel to sit on.
On Saturday, September 24 2011, nudists gathered at the top of the Castro District to protest and show people ‘nude is not lewd’. Approximately 20 to 30 people took part in a peaceful event.
I had to take down the gallery because of Google’s violation warnings. It’s against their policy to display ads with adult content. Naked not allowed.
**UPDATE: I have since been told it is not legal to be nude in public places.