Within the naturist community, it is considered good manners to sit on a towel, when sitting on benches, chairs, etc. It's also considered proper to dress for dinner. Every naturist with sense wears an apron in the kitchen!!
Years ago Daytona Beach had young ladies in G-string bikinis selling hot dogs on the beach. Lots of hotdogs were sold but the city had to pass some new laws because the ladies couldn't pass sanitary inspections - yuck.
That is why you always have your towel. Don't you know anything about Hitchhiking through the Galaxy?