It was to no avail for nudists and naturists to try to explain that nakedness had nothing to do with eroticism or sexuality." More: History of Nudism
If you see a small problem with this (there were no nudists/naturists in the Middle Ages), then you can understand why we titled this "Another Interesting Approach..." There have been many articles depicting the history of nudism/naturism that take us far back into history presumably to 'justify' our preference for nudity, but the fact is that the way we experience being nude today has little relation to any of it. These are apologetic theses trying to justify why we, here in 2014, like to run around without our clothes on!
We need no historical justification. Social nudism is a relatively new thing and is totaly unrelated to the Middle Ages, Greeks, or mythical Biblical allusions. We are because we are, and we enjoy it for of our own reasons. If we need to defend anything, let's 'defend' what and why we are as we are now, today, in the 21st Century. Let's explain why our chosen lifestyle.behavior is not socially destructive, weird or perverted. No one gives a hoot about ancient Greeks.
No one is going to see us as decent human beings in today's society simply by pointing out that Greek athletes (represented elsewhere as rather indiscriminate as to which gender they had sex with) were sometimes without clothing. Oh yeah, and few mention that women weren't allowed at those events...