Thanks Stevin, your explanation is spot on target!
I can reveal that the beach I went is public, however there is a naturist campsite behind the beach. This bar is owned by the campsite and is the means of getting to the beach and campsite. You need a security pass to enter the campsite (via the back of the bar), but they are happy to serve you food and drink, as long as you are naked. The other two beach bars are textile (you have to dress to enter) and it provides plenty of entertainment seeing people get it wrong!!
Over the past few years, the staff of the nude bar have all started to be dressed themselves, which is a shame as they were usually female students working the vacation. Yesterday, every staff member was dressed