wife swapping

American  

noun

1. sexual activity in which two or more married couples exchange partners.

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wife swapping British  

noun

1. 1. the temporary exchange of wives between married couples for sexual relations

   2. ( as modifier )

      a wife-swapping party

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Etymology

Origin of wife swapping

First recorded in 1955–60

Example Sentences

Bob & Carol & Ted & Alice’ about wife swapping, and ‘Coming Home’ about Vietnam veterans, ‘An Unmarried Woman. about female liberation.”

From Salon

The parents engage in wife swapping!

From New York Times

There is clearly work to be done in British badminton if it is not to revert to its former incarnation as a game mostly played for a bit of hearty fun between suburban married couples in towns where wife swapping has not really taken off properly.

From The Guardian