I ride round the Park in the evening after the gates are shut to cars. I think the doggers tend to drive to their parties and bring their own Latex.
Several years ago I was at a meeting (work - honest) on the top of Portsdown Hill
Simple trip along the top and down a wonderful downhill to Fareham
Caught short, so nipped into one of the car parks to empty the bladder and suddenly there was a very interesting scene with lots of cameras and video... and a couple of undressed young ladies.
I left quickly