The nudist beach beyond Sand is very secluded. I was surprised about the remark about nudist beaches not being "acceptable".
Anybody who walks past the nudist sign knows what they are going to see and could very easily stay on the other side. Of course there are always people who will go there to have peek...
Throughout the whole of beaches in France, when bathers are sparse, people tend to be naked and it's no great issue.
Regarding the nudist beach in Cupecoy, it is mainly a place for swingers or perverts who come their to look a naked people and then indulge in obscene behavior, you have been warned !