Brit Dopers, is this for real?

Anytime a news story mentions the Internet spawning/exacerbating some craze, my bullshit-o-meter goes off. This rang a couple of bells: an abcnews.com story tells about “dogging”, which is apparently the newest pastime of having sex in English parks.

I’m skeptical, but then, you English are horndogs. What’s the story?