Firstly, just to save my editing fingers, there is a difference between a naturalist and a naturist. David Attenborough is a naturalist – he seems to get by without succumbing to the urge to remove all his clothes.
He would only be a naturist if he frequented nude beaches or did his TV shows in the buff. So far there is no evidence of either of these things having occurred.
The gentleman in this post may well be a naturalist but, in threatening to expose himself to the world, he is a potential naturist.
And getting back to the question, I did what everybody else does in these situations and consulted the Interweb. Here is the response on JustAnswers:
If you are in your private home it is not an issue.Backyard will depend on whether you can be seen by your neighbours and whether they complain. It is not a criminal offence but if they complain they can get an order from the court that you stop.Outdoors and in public other than nude beaches it is a criminal offence and all states have their own laws.
According to this website, Obscene Exposure is defined thus: “A person shall not, in or within view from a public place or a school, wilfully and obscenely expose his or her person.”
“Obscene” is defined as something that would offend a reasonable person.
In the circumstances outlined above, the greatest danger is that the local council will dismiss the objection as bogus, flippant and mischievous, undermining legitimate and well-founded opposition to the plan.