The World Naked Bike Ride took place on Saturday - in protest not against clothes, but against car culture.
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The annual event aims to raise awareness of cycling as an environmentally friendly option and takes place in over 50 cities around the world.
Hundreds of bare-bottomed (and/or bare-chested) cyclists took to the roads of London as part of the celebration-slash-protest. Check out pictures from The Big Smoke, and other cities around the world, in our slideshow below...