A married couple, both in their 70's go for lunch at the tavern where the met. The husband leans over and asked his wife, "Do you remember the first time we had sex together over 50 yrs ago? We went behind this very travern where you leaned against the back fence and I made love to you."Yes, she said, "I remember it very well."Ok, he said, "How about taking a stroll around there again and we can do it for old time's sake?""Oh Charlie, you old devil, that sounds like a crazy but good idea!"A police officer sitting in the next booth heard their conversation and having a chuckle to himself, he thinks to himself, "I've got to see these 2 old-timers having sex against a fence. I'll keep an eye on them so there's no trouble." So he follows them.The elderly couple walks haltingly along, leaning on each other for support aided by walking sticks. Finally, they get to the back of the tavern and make their way to the fence.The old lady lifts her skirt and the old man drops his trousers.As she leans against the fence, the old man moves in.Then suddenly they erupt into the most furious sex that the policeman has ever seen. This goes on for ten minutes while both are making loud noises and moaning and screaming.Finally, they collapse, panting on the ground.The policeman is amazed. He thinks he has learned something about life and old age that he didn't know.After about half an hour of lying on the ground recovering, the old couple struggle to their feet and put their clothes back on.The policeman is still watching and think to himself, "This is truly amazing, I've got to ask them what their secret is." So as the old couple passes, he says to them, "Excuse me, but that was something else. You must have had a fantastic sex life together. Is there some sort of secret to this?"Shaking the old man is barely able to reply, "Fifty years ago that wasn't an electric fence!"