I'd never heard of "dogging" before catching "Public Sex" on Sundance. Even British reviews of this UK flick took inexplicable pleasure in belittling it. At a minimum, it deserves a cult following, much like its subject. Subtitled "A Love Story," this overlooked, naughty-but-nice gem uses occasional pseudo-documentary touches. Its main character, a young, unemployed, "investigative" journalist, shines a light, if you will, on the British phenom of dogging, couples shagging inside cars, at night, in public areas frequented for just that purpose. And dogging devotees aren't particularly shy about onlookers. Asked "How did you get into it?," one dogger responds, "How can you not get into it?" This proves true as the characters in "Public Sex" use dogging to find what they're really looking for and discover that, as one car door closes, another opens. Dogging, anyone?