Amazing

The husband leans over and asks his wife, "Do you remember the first
> time we had sex together over fifty years a go? We went behind this
> very tavern where you leaned against the back fence and I made love to
> you."
>
> Yes, she says, "I remember it well."
>
> Ok," he says, "How about taking a stroll around back there and we can
> do it again for old time's sake?"
>
> "Oh Buddy, you old devil, that sounds like a crazy, but I like the
> idea!"
>
> There's a police officer sitting in the next booth listening to all
> this and having a chuckle to himself. He thinks, "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 follows them.
>
> They walk 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. Suddenly they erupt into the most furious sex that the watching
> policeman has ever seen. This goes on for about ten minutes.
> Finally, they both collapse, panting on the ground.
>
> The policeman is AMAZED!
>
>
> He realizes he has just learned something about life that he had not
> known before. 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, still watching thinks, "This was truly amazing. I've
> got to ask them what their secret is."
>
> As the couple passes, he says 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?"
>
> The old man says, "Fifty years ago that wasn't an electric fence.