A young wife, her boorish husband and a young good looking sailor were
shipwrecked on an island.  One morning, the sailor climbed a tall coconut
tree and yelled, "Stop making love down there!" 
"What's the matter with you?" the husband said when the sailor climbed
down. "We weren't making love."
"Sorry," said the sailor, "From up there it looked like you were."
Every morning thereafter, the sailor scaled the same tree and yelled the
same thing.  Finally the husband decided to climb the tree and see for
himself. With great difficulty, he made his way to the top.  The husband
says to himself, "By golly he's right! It DOES look like they're making
love down there!"