As much as I'm a nudist, I believe in being respectful where I sense it to be appropriate this won't exclude to have some fun sexually somewhere out there in nature and if so, only away from the presence of others who could be offended. We can do many things out there or at home, as long as the participating company and situation does support our actions.
I would have thought that in TN we would know the difference. I'm in TS and would expect a blurring there. I know the difference between nudity and sex - both in my natural behavyour and in my head. I thought it was only textiles that confused the two. OK I like sex just like any man but I get pleasure from nudity in itself. I respect the views of those around me so wouldn't mastebate in front of a salesman even in my own home (unless he'd made it clear he was up for it - maybe by exposing and playing with an erection himself).
Long may we enjoy nudity and sex and know where to draw the line. As a line in the sand it may change with each new tide but it should still respect the feelings of others.