Free wheeling
In more than 20 countries around the globe, cyclists strip down and head out to take part in World Naked Bike Ride events.
Nudity is optional but encouraged during these rides, which are designed to promote cycling. Many choose to bare it all.
Slideshow
Cyclists prepare to pour onto the streets of Portland for the 11th annual World Naked Bike Ride, which promotes cycling as an alternative to driving cars.
A woman in red paint and wings gets ready to join thousands of other cyclists in Portland.
A rider in body paint takes part in a ride on Westminster Bridge in central London.
Bystanders react as naked cyclists ride past them in Mexico City.
Riders take part in the London event.
In Mexico City a rider pokes her tongue out as she looks through an empty television screen.
Dennis Crane, 54, wears “the emperor’s new clothes”.
In London, a rider wears a Mexican-style wrestling mask.
Another London rider wears a Prince Harry mask.
A painted rider wears a mask of Queen Elizabeth.
A bystander looks shocked as naked men ride past her in Los Angeles.
A naked cyclist rides over Westminster Bridge in London.
Riders gather under a bridge in Los Angeles.
A cyclist flies a U.S flag from his bike.