I'm Josh, VT's other nudist. Guess whose fault it is? Michael's! (username is =O).
Nudism is basically doing everyday things, sports, socialization, games, etc. in the nude. It's relaxing and gives one a sense of body freedom, and it isn't sexual at all. Unfortunately some websites get some innappropriate pictures of children and teens posing nude and call it "nudism". I've seen some nudist websites with lots of pictures of kids and teens; however those pictures are more tasteful than the ones you seem to have come upon.
So just know that nudism is meant to be fun, make you feel free, and not about sex and if you ever want to know more about it just PM me or =O.