The 5th wheel dating show
It carries the connotation that the fifth person is often an unneccesary and unwelcome addition to the scene in these conditions.
Derived from "the fifth wheel of a car", which needing only four wheels to run, has no need of a fifth.
Then a provocative 5th man or woman (hence, "the fifth wheel") would join the group.
In order to save some money we didn't get cable TV, and hardly went out that much.
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