Thousands of hardy cyclists biked in the buff as part of the fourth annual World Naked Bike Ride Day in host cities including London, Paris, Madrid and Vancouver.
Billed as the "most exhilarating cycling experience since taking off your training wheels", the ride sought to draw attention to oil dependency and celebrate the power and individuality of the human body.
In the London ride, several participants used their exposed real estate to paint slogans reflecting the message of the movement, such as "Less Gas, More Ass".
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