I wish you had asked the question, what is wrong with being naked with a hundred other people who all want to be naked with you. That is closer to the conversation at hand than your statement. Surely there is nothing wrong with being naked with a 100 other people of ALL ages and playing volley ball with them and doing ballet classes with them. Surely there is nothing in the world wrong with nudist colonies at all is there. No, no harm could ever come of that could it.
Correct. There is nothing wrong with nudist camps where people of all ages enjoy social nudity and wholesome nude recreation.