Originally Posted by SLO
Okay, since nobody has asked, whats the deal with the naked dude??
There are certain occasions in San Francisco where people--a few people--have simply got in the habit of walking around sans clothing. The Folsom Street Fair (street celebrating gay leather/S&M etc on a street once lined with bars catering to that crowd) is one. But so is the Bay to Breakers footrace which happened to be yesterday and which I mentioned above. It passes through the neighborhood KOTH was photographing. I'm guessing this guy was either participating (only the leaders actually run--crowds of others just having fun walk along behind) or in the crowd watching.
There's even an official web site called "Bare to Breakers": http://baretobreakers.com/
On the other hand, another segment of the SF population removes as much clothing as possible in the rare warm weather, which this weekend also was--guys in particular just walk around shirtless all over the city and some go even further in certain areas. I mean it doesn't happen often that the temperature breaks 70 degrees (Saturday and Sunday it broke 90).
Just my guess until we get a definitive answer.