Two couples face the same kind of problem, although in different degrees.
Hal is an engineer, working for a company where he's about to be downsized. If he gets laid off, it'll be difficult, perhaps impossible, for him to get a decent job in any reasonable time frame. If he remains unemployed for any length of time, he'll probably lose Hanna, his wife. Hal is looking for another job, but the search seems hopeless.
Brooke is the wife of Bert. Brooke has two choices, she can accept a field assignment which should lead to advancement in her profession or she can take a layoff, with a suitable job very hard to find.
Hal works for Bert.
Bert comes up with an idea that will solve Hals' problem and Brooke's problem, but at a cost. Bert's idea is to assign Hal to a field job, at the same remote site where Brooke will be working. Thus, Hal will remain employed, solving one of Hal's problems. Bert knows that Brooke will play around on him, if she's without sex for any extended period of time. Bert develops a plan and proposes a solution to the group's problems.
Hal and Brooke will take jobs at the same, remote field site and will then enter into a sexual relationship.
Meanwhile, Bert and Hanna will stay in the city and will enter into their own sexual relationship.
Each of the people will cheat on their spouse, but only with the spouse of the other couple.
The idea sounds insane at first, but it then seems to be the only way that jobs and marriages can be saved.
The couples first do a partner swap, to see if the proposed couples are sexually compatible. They are.
Then, Brooke and Hal relocate to the remote field site. Brooke and Hal are sexually compatible, but can stud Hall live in Brooke's work related, political world?
Can rich wimp Bert deal with Hannah, the wife of poor, stud Hal?
Brooke and Hal try to work out their concerns, discovering that they each need to adapt to some unexpected changes.
Hal has to learn to deal with others.
Brooke has to learn to deal with herself, in a new role.
Bert and Hannah also try to work out their concerns, discovering that they each need to adapt to some unexpected changes.
Complicating the issues is the fact that the two couples remain in telephone contact during the 'Swappernaut' voyages of discovery. The couples can obviously see changes in each other and they have to, somehow, adapt to the changes.