It is common etiquette in nudist colonies that you always have a towel with you to sit on. No, I am not one!!!
Naked and Afraid is one of the few shows I watch. Interesting to see how the personalities work together. The nakedness is not seen (except from behind) and is incidental, IMO. I agree, I could never do it. They had one episode where someone dropped out before they even started, just on the reputation of the location they were going to be in.