SiL and BiL have always been naturists, her upbringing. He was fine with it, and they had a little daughter. We always just said, we don't want to see your holiday snaps! But then my niece became a young teen and had her first period - she became violently anti, so no more holidays of that nature. They went all over the world. As my Sil said - they had far less luggage than anyone else on the planes! 
I asked BiL what his first impressions were. He said - far better grooming 'down below'.
He said there's nothing like the first time you are playing with your DD in the sandpit, turn round quickly and come face to * with a full Brazilian!
I've often swum naked in the med, we used to hire a pedallo or something and go out to a pontoon, strip off and swim. It's a wonderful feeling.