The Oregon city played host to the 11th annual World Naked Bike Ride on Saturday night The event is a celebration as well as a protest calling for increased cycling and decreased use of cars and fossil fuels Thousands of bicyclists, many of them stark naked, poured into the streets of Portland, Oregon on Saturday night for the 11th annual World Naked Bike Ride, a protest that promotes bike riding as an alternative to driving cars. Nude cyclists with lights flashing in their tire spokes rang bells as they barreled down avenues lined with cheering spectators, while a naked, apparently pregnant woman rode in a bike trailer. 'This is a party, but it's also a protest,' said Carl Larson, a ride spokesman. 'It is about oil dependence, cycling vulnerability and body image.' +7 Cruising: Thousands of cyclists, most of them fully of partially nude, poured into the streets of Portland, Oregon on Saturday night for World Naked Bike Ride Cyclists