A man and his wife had been stranded on a deserted island for many years.

The morning following a bad storm, a new guy washes up on the shore. The new guy and the wife are very attracted to each other right away, but realize certain protocols will have to be observed. The husband, however, is very glad to see the second man there.

"Now we will be able to have three people doing 8-hour shifts in the watchtower, rather than two people doing 12-hour shifts."

The second man is only too happy to help and in fact volunteers to do the first shift. He climbs up the tower and stands watch, observing the ocean horizon for any ships. Soon the husband and wife start placing stones in a circle in order to make a fire to cook supper. The second man yells down: "Hey, no screwing!"

They look at each other and yell back: "We're not screwing!"

A few minutes later they start to put driftwood into the stone circle. Again the second man yells down: "Heeey, no screwing!"

Again they yell back, "We're not screwing!"

Later they are putting palm leaves on the roof to their shack to patch leaks. Once again the second man yells down from high above: "Hey, I said no screwing!!"

They yell back "We said we're not screwing!!"

Finally the shift is over and the second man climbs down from the tower and the husband starts to climb up. He's only half-way up and the wife and the second man are screwing their brains out. Once he reaches the top, the husband looks out from the tower and says:

"Son-of-a-gun. From up here it DOES look like they're screwing."