Reluctant Stories

There are things, old and dark in nature, which have power over humans, things that may be hidden for centuries, only to come out into the light of day again and be used to feed the appetites of evil men. But what if one of those things came into the possession of someone who wasn't evil? Say a teacher and one of her students obtained it. Could it be used for good? Or would its history of darkness make them do something taboo, something forbidden?

The husbands of two well-to-do young couples conspire to change their prudish wives into swingers. Things really heat up when the wives accept swapping and sugest bringing a new young couple into the fun and games.