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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.

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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.
. PORTLAND, United States. REUTERS/Steve Dipaola

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.
. PORTLAND, United States. REUTERS/Steve Dipaola

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.
. LONDON, United Kingdom. REUTERS/Andrew Winning

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.
. MEXICO CITY, Mexico. REUTERS/Tomas Bravo

Bystanders react as naked cyclists ride past them in Mexico City.

Riders take part in the London event.
. LONDON, United Kingdom. REUTERS/Andrew Winning

Riders take part in the London event.

In Mexico City a rider pokes her tongue out as she looks through an empty television screen.
. MEXICO CITY, Mexico. REUTERS/Tomas Bravo

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”.
. LOS ANGELES, United States. REUTERS/Lucy Nicholson

Dennis Crane, 54, wears “the emperor’s new clothes”.

In London, a rider wears a Mexican-style wrestling mask.
. LONDON, United Kingdom. REUTERS/Andrew Winning

In London, a rider wears a Mexican-style wrestling mask.

Another London rider wears a Prince Harry mask.
. LONDON, United Kingdom. REUTERS/Andrew Winning

Another London rider wears a Prince Harry mask.

A painted rider wears a mask of Queen Elizabeth.
. LONDON, United Kingdom. REUTERS/Andrew Winning

A painted rider wears a mask of Queen Elizabeth.

A bystander looks shocked as naked men ride past her in Los Angeles.
. LOS ANGELES, United States. REUTERS/Lucy Nicholson

A bystander looks shocked as naked men ride past her in Los Angeles.

A naked cyclist rides over Westminster Bridge in London.
. LONDON, United Kingdom. REUTERS/Andrew Winning

A naked cyclist rides over Westminster Bridge in London.

Riders gather under a bridge in Los Angeles.
. LOS ANGELES, United States. REUTERS/Lucy Nicholson

Riders gather under a bridge in Los Angeles.

A cyclist flies a U.S flag from his bike.
. LOS ANGELES, United States. REUTERS/Lucy Nicholson

A cyclist flies a U.S flag from his bike.