The husband leans over and asks his wife, "Do you
remember the  first time we had sex together over
fifty years ago?

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 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!"

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. Both  are making
loud noises and moaning and screaming. Finally, they
both 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, still watching thinks, this was truly
amazing. He thinks, 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."