[讨论]A puzzle

往事不用再提

Three jealous men take their wives out for a trip.No one wanted to leave his wife either of the other two men.Now they have to cross a river in a boat which can only take two people at a time. The men are extremely jealous and no woman will have a chance to stay together with any other man without her husband being present.How do they cross the river?


[What's your idea?Please give it.The one who first post the idea will be paid $500 in c114 currency ]