San Francisco’s proposed ban on public nudity has left the city divided between those favoring laissez-faire free expression and those tired of seeing a daily parade of shriveled schlongs and sagging boobs. By a 6-5 vote on Tuesday, the City’s Board of Supervisors approved the ban in most public places, including streets, sidewalks, public transit and parks. Exceptions would be permitted on occasion, say, during the annual gay pride march. While the measure is now closer to passage, it still is subject to a final vote, and must be signed off on by Mayor Edwin Lee, before it would take full effect next year.