The Moon Is a Harsh Mistress
Group marriage appears in some of the novels of Robert A. Heinlein such as "Stranger in a Strange Land" (1961), "The Moon Is a Harsh Mistress" (1966), "Time Enough for Love" (1973), and "Friday" (1982). "Stranger in a Strange Land" describes a communal group much like the Oneida Society. In at least "The Moon Is a Harsh Mistress" and "Friday" group marriage is called "line marriage".