Hampstead Heath is an excellent place to expose oneself. It is very common and more-or-less allowed. The authorities have always avoided the Heath as they know it is notoriously a location for mischief. The grass gets quite long and there is a patch of meadow where the more adventurous go. It is always a thrill to flash my wet labia at fellow leisure seekers, work out which ones are up to watch and sometimes which are willing to participate. It’s quite alright to make a noise here too. I certainly did yelp when I brought my clitoris to a slippery climax