I think this is a really interesting question, because it raises an issue of "statute law" vesus "public accepteance".
From the statute law veiwpoint, a person can take photos in a public place unless there are restrictions that prevent them from doing so. So if we are talking about a nudist beach for example, unless there is a sign saying no photography, anyone can basically come along and take photos.
When it comes to public acceptance however, I think most people would frown upon it because of the circumstances. In other words, if there are minors involved, most people would say that taking photos would be inappropriate behavior regardless of what the law says.
As for web sites, I think you could get into a lot of trouble if you publish photos of nude minors anywhere. The laws are always getting tougher in this area, as is the way such things are investigated and handled by authorities. Pretty much anything involving minors could be considered "child pornography" these days - even movies that were perfectly legal when they were released, but are now illegal because they have been reclassified. There are plenty of movies from the 1970's era in particular, that are now banned in Australia because of reclassification.