The husband leaned over and asked his wife, "Do you remember the first time we had sex together over fifty years ago? We went behind the village tavern where you leaned against the back fence and I made love to you.”

“Yes,” she said, “I remember it well.”

“OK,” he said, 'How about taking a stroll around there again and we can do it for old time's sake?”

“Oh Jim, you old devil! That sounds like a crazy, but good idea!”

A police officer who was sitting in the next booth heard their conversation and, having a chuckle to himself, he thought to himself, “I've got to see these two old-timers having sex against a fence. I'll just keep an eye on them so there's no trouble.” So he followed them.

The elderly couple walked haltingly along, leaning on each other for support aided by their walking sticks. Finally, they got to the back of the tavern and made their way to the fence. The old lady lifted her skirt and the old man dropped his trousers. As she leaned against the fence, the old man moved in. Then suddenly they erupted into the most furious sex that the policeman had ever seen. This went on for about ten minutes while both were making loud noises and moaning and screaming wildly. Finally, they both collapsed, panting on the ground.

The policeman was amazed. He thought he had now 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 struggled to their feet and put their clothes back on. The policeman, who was still watching, thought to himself, this was truly amazing. I've got to ask them what their secret is.

So, as the couple passed, he said to them, “Excuse me, but that was something else. You must've had a fantastic sex life together. Is there some sort of secret to this?'”
Shaking, the old man was barely able to reply, “Fifty years ago that wasn't an electric fence.”