Two sets of young marrieds, Day & Fanny Illington and Ferd & Ida Jackson take a weekend trip together. Avid golfer Day ignores Fanny as Ida does Ferd. At his suggestion he and Fanny attend an island "affinity" party for people neglected by their spouses. Accidentally left on an island they struggle back to the mainland only to discover Day and Ida have been having an affinity party of their own! Everyone realizes the error of their ways and resolves that they were already married to the ones with whom they had the most affinity.