This summer we went camping in France. We stayed two weeks at Castillon de provence, near 'les Gorges du Verdon' in a caravan that we rented. We don't have much naturist-campsite-experience, but it seemed a very good place for us. Places were big, you had enough privacy and grass/trees. There were many people, but it never felt crowded. It's owned by a dutch couple and about 90% of the visitors were dutch-speaking (which is bot, a good and a bad thing :-) ).
There were a few outer couples in their twenties (even a few Belgian naturists that we knew before, what a coincidence) and quite soms teenagers (with their parents, many of them came there every year, they knew each other, and they volunteered/worked there too). So for young people it can be a good place I think.
One of the things I like about naturist-campsites (although at first it was a bit strange) are the public showers. Or better: I liked them at this campsite because you had a great view over the valley and the nature: great if you just wake up!
We will probably go back...