Stripping off for a good cause. Or just for fun. (NSFW because butts.)

Summer might be over, but it seems nobody in Australia is ready to let go.

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In Melbourne on Sunday, cyclists took part in the annual World Naked Bide Ride, a clothing-optional (read: off) ride intended to be a peaceful protest for body positivity, cyclist safety, environmental issues and alternative lifestyles.

Scott Barbour / Getty Images

Just going for a casual Sunday ride. Nothing to see here.

Scott Barbour / Getty Images

This guy is pretty happy about being naked.

Scott Barbour / Getty Images

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