When Lily Hitchcock Coit donated money to beautify the city, and a tower was built in her name, a lot of locals suggested that it looked like a firehose nozzle, not surprising given her love of firefighters. Others over the years have suggested a more phallic image.
But that's nothing compared to the new tower that is slated for the Transbay Terminal site.  The round shaft, the distinct head at the top ... it's the Giant Dick in the Sky! Coming soon to downtown San Francisco.