[1] Vic Hammond and his wife Mary go to a cocktail party hosted by their friends Jerry and Samantha Rainbow.

Many meetings are subsequently held between the two men in which they plan every detail of the scheme.

At one point, in order to ensure that the deception is as complete as possible, they even agree to describe the sexual routines they adopt when making love to their wives.

Vic, who is very proud of his own approach and sexual technique with his wife, is particularly outraged when Jerry criticizes his routine.

But in the middle of having sex with Samantha (in total darkness), Vic realizes that in the heat of things he has forgotten to copy Jerry's technique.