The flood and the jealous husbands
After a flood, three couples were surrounded by water and were forced to flee their hotel on a boat that could hold no more than three people at a time.
Each husband was so jealous that he would not allow his wife to stay in the boat, or anywhere, with any other man (or men) unless he himself was present. Find a way to save couples using as few crossings as possible. Swimming or using a helicopter is not allowed!