Couples Sharing in the Faith — A Universe from the Mind of Peter Duncan

A story in the Couples Sharing in the Faith Universe
Penny Chapman, after having been sexually involved with her college roommate Miriam Stern for two years, lost track of Miriam. Deciding to contact her two years later she arranges for Gary and Charie Holbrook and she and John to visit them during a trip to New York City. They are invited to dinner, after which they split up with Miriam and Zack, and Gambo and Quivina Obaraku, Columbia students from Nigeria, Africa to enjoy an evening of swinging sex.

A story in the Couples Sharing in the Faith Universe
Gary and Charie Holbrook meet in college get married and, after a year, move to a new community. At church they meet a couple and become friends. At dinner they talk about a relatively new concept that has been taking place in the USA, wife swapping. If the story appeals to you can find the series under Couples Sharing in the Faith

A story in the Couples Sharing in the Faith Universe
This is a rewrite that merges the history of the Musketeers--three WWII swinging couples--with two swinging couples dating from the '60s, one of whom is the daughter of two of the original Musketeers. It wraps around the Christmas segment of "Couples Sharing in the Faith" Where three original members of the Musketeers get together with the two younger couples, and tell the story of how the Musketeers got together and all become sexually involved with one another.