Above is a link to an article about Nudist Etiquette. It has been a popular question lately to me especially regarding nude fitness and nude yoga. It is a good, quick read. I especially agree with the sexual rule. There is no room for such in my class. If it is inappropriate with clothes on in a gym or any public area, it is the same in my class. Be polite. Be clean physically, mentally, spiritually and all will be well. Namaste and enjoy.