There is a massive dogging place at a woods near a place called Chicksands in Bedfordshire. (I'm at work so can't really google it)
Me and my mate went one night for a laugh, we pull up in his Astra and he tells me he knows the signals.. So we sit in the dark for a bit, he then flashes the interior light on and off a few times, next thing we see some random guy strolling upto the window! Didn't look long enough to see if he had his cock in his hand, just did a massive wheel spin and got the hell outta dodge. A few months later they put a burger van in that bid of the woods, was there every night.