Okay....let's all slow down a bit please. We don't know where the OP is from, what culture they're from and so on.
What's normal in England or Australia would not be normal in middle eastern countries, for example.....to be honest, I don't know the score here, when I've gone swimming, I never noticed any nudity but then I suppose I wouldn't.
On the other hand, when I lived in Scandinavia, I was surprised at how much nudity you see! In Sweden it's very normal for people to change in their homes in full view of the street without drawing any curtains for example, wouldn't be acceptable in England..
...bit harsh guys..