We found ourselves asking ourselves lots of questions when we decided to post this piece of urban art that SFist reader Mike found on the corner of Sutter and Larkin last week. We were like, is this not suitable for work? It's just graffiti, and it looks just like all the beautiful vagina clichés that are cliché for a reason. It's like a lovely clam, or a caterpillar transforming into a butterfly, or a head......