[1] A satire of the sexual revolution of the 1970s, the musical takes place on Christmas Eve in suburban Trenton, New Jersey, where two married couples who have been close friends since high school find themselves contemplating a ménage-à-quatre.

In Trenton, New Jersey, old high school buddies Wally (now an executive in public relations) and Alvin (a furniture mover) discuss the possibility of adding some spice to their lives by having a foursome.

Alvin and Cleo arrive for dinner on Christmas Eve, and while Monica is initially unhappy with the arrangement, she ultimately agrees.

The title song was notably recorded by Frank Sinatra in 1976 and released as a single in January 1977, before the musical had even premiered.

Directed by Gene Saks and choreographed by Onna White, the cast included James Naughton as Wally, Joanna Gleason as Monica, Lenny Baker, as Alvin, Ilene Graff as Cleo, Michael Mark (guitar) as Stanley, Joseph Saulter (drums) as Quenton, John Miller (bass) as Harvey, and Ken Bichel (piano) as Norman.

This starred Jason Alexander (Alvin), Vicki Lewis (Cleo), Patrick Cassidy (Wally), and Lea Thompson (Monica).