I have been to St Osyths a few times always mid-week, I do agree that things do go on,but you could, most probably, find that on many naturist beaches if you were to go and look for it.With regards to the lookers,most of us have a voice,so a polite word to them should do the trick.I go to St Osyths to enjoy the freedom  of being naked in the sun,what others get up to is their business and  the remoteness now the road has been washed away,has stopped many of the merecats. 🙂