We were in a restaurant in central London last summer when a naked bike ride passed us, twice, the second time stopping at lights for some time.
Most of the people in the restaurant were laughing at them. At the lights several men got off their bikes for a quick stand/stretch/look around, all fully naked. Personally I found it uncomfortable and to me it was exhibitionism.
Seeing the naked women made me feel even more uncomfortable, although many had thongs/shorts on, and painted breasts or something around their neck. Despite their bravado I felt they looked vulnerable. I know this is me projecting to some degree, but a naked woman in public is vulnerable, even if only to voyeurs.