San Francisco is famous for its nudity and shenanigans in events like Bay to Breakers, Folsom Street Fair, and Halloween on Castro Street. To add to the list, don't miss the Air Sex 2010 World Championships tonight. Talk about a rapid change in your evening post-work...

To picture the event, imagine an air guitar, minus the guitar, plus the sex partner. You can choose a clip of music, arrive in whatever garb you like, and take a chance on stage to show off your moves.

Share this ridiculous event with your friends, and bring them along tonight for a less-than-PG evening.

Check out the air sex championships and grab $15 tickets here.