There is one super little beach about 1.5 km South (anticlockwise) from Potos. There is a lay-by on the road which often has a few cars or mopeds parked in it. It is small and on two occasions my contributor found Greek families already there who politely replied that they would rather he didn't go nude when asked, but on other occasions it was mostly nudist or mixed. It appears to be one of those places where the first party there gets to decide.