I remember watching a documentary about naturism / nudism and the terminology was explained as follows:
Naturists tend to be the older more traditional group, who regard public nudity as completely asexual and in terms of health benefits (improving your Vitamin D hit for instance) and companionship
Nudists tend to be from the younger generation, and as such are more sexually liberated, and play up to the naked-means-naughty mentality. There is (or was) a lot of feuding between these two factions.
Exhibitionism I think is separate again from the two above as this implies displaying one’s body to be looked at and admired (and possibly to cause shock) – that’s my take…
