I remember a great science fiction novel, Dancers in the afterglow by Jack L Chalker, (well, it was great when I was in Grade 6) that had people meeting and ran

I remember a great science fiction novel, Dancers in the afterglow by Jack L Chalker, (well, it was great when I was in Grade 6) that had people meeting and randomly shuffling their own personalities/experiences with someone else after reaching adulthood. And then, after they had memorized and picked up the new personality, doing it again with someone else.