There is a category of photo and video porn material called “Naked/nude in public”. It shows young ladies, nearly always, wandering around places undressed.
It amuses me somewhat, for various reasons.
In so many countries, being nude outside with people seeing you is not illegal. It all depends on intent. Take the UK. Here is guidance on the rules: https://www.tripsavvy.com/nude-beach-behavior-and-etiquette-1662468
As you can see, it is very precise in a vague kind of way. As I understand it, put simply, unless you are waving your bits around in a provactive way for all to see, you’re ok. And, in cities like Barcelona, full nudity is allowed I am told.