A man wanted to determine if both his wife and mistress were faithful to
him. So he decided to send them on the same cruise, then later question
each one on the other’s behavior.
When his wife returned, he asked her about the people on the trip in
general, then casually asked her about the specific behavior of the
passenger he knew to be his mistress. “She slept with nearly every man
on the ship,” his wife reported.
The man then rendezvoused with his cheating mistress to ask her the same questions about his wife. “She was a real lady,” his mistress said. “How so?” the encouraged man asked. “She came on board with her husband and never left his side.”
Serves him right 
where does it say the couple was american… plz refrain from making rasict remarks.