Just when you think you're alone, suddenly there are 25 cops on bikes...

... what are the chances that all 25 of them would look the other way?

"There they are, on the first base line... There's a bench, she is bent over the bench and our friend is behind her with his pants down to his ankles banging away."

Can we extract some tips for how to get away with having sex outdoors? Quite aside from the bad luck of 25 cops, I can see at least 3 major flaws in their tactics.