I had once an interesting experience with 3 german elders. They invited me to the sauna. In germany, most saunas are mixed and the unwritten rule is that you 'have to be naked'. Shorts, swimwear, underwear, etc. is not allowed. Only a big towel, to impede direct skin contact with the wood.
We were in the locker room and suddenly a fully naked lady walked through to get to the open sauna area. She had absolutely nothing on (at the point neither did I). Immediately I looked at the 3 elders, they just smiled. We then went into the open sauna area (this was a big place with several saunas, you could go from one to the other or go to the different pools) where everybody was only equipped with a towel. A lot of them carried it on their shoulders. For them, including the elders, it was the most normal situation. I, having recently moved to germany from the states, was more than a little surprised and questioned them about the appropriateness ofbeing there. They said, this is sauna and this is the way it works. Do not worry.
Inside the saunas, everybody dropped the towels, and sat there, men and women, young and old, beautiful bodies and ugly ones, families and singles. I even had a conversation inside the sauna with a family, just like you do during little league with other spectators... nobody seemed to care about nakedness. For me it was a definitely liberating experience. You are probably thinking that it was a naturist club or something, well, it obviously was, but it was not advertised as such. It was just a big sauna! And most gyms offer exactly the same experience if you go to the sauna (except when they offer women's day or something).
My point? Nakedness varies by culture, and I am not talking about indigenous people in the amazon. It's like when Janet Jackson's dress malfunctioned, some of the news anchors in germany had to laugh on camera after presenting the news, wondering why such a big deal was being made in the states about it...
Vivalavida