A man, his wife and a good-looking stranger are stranded on a desert island. The wife quickly loses interest in her husband and begins flirting with the good-looking stranger.
The three start to build a watchtower. The stranger offers to take first watch. While the husband and wife gather driftwood on the sand, the stranger yells, "Hey! No sex on the beach! Get back to work!"
The husband yells back, "We're not having sex!"
Later, the stranger yells out to them again. Again, the husband yells back and corrects him. This happens several times during the stranger's shift.
Finally, the husband's takes his shift in the watch tower. His wife and the good-looking stranger make passionate love on the beach.
The husband on watch exclaims, "Wow, it really does look like f**king from up here!"