The 5th Wheel was a spinoff show that was created after the huge success of the sister show, featuring more provocative and sexual content and airing between 2001 to 2004.
Each episode would begin with a group of four daters divided 2/2 by gender.
After all combinations of man/woman spent some time together and interviewed (privately) how they felt things were going, the titular "5th Wheel" would be introduced.
Some of the more popular specials were "Hot Tubs of Horror" (and its sequel) and the "Extremely Uncensored Games" (a sports parody complete with animated announcers).
Men and women are rotated to meet each other over a series of short "dates" usually lasting from three to eight minutes depending on the organization running the event.
At the end of each interval, the organizer rings a bell, clinks a glass, or blows a whistle to signal the participants to move on to the next date.
Speed dating is a formalized matchmaking process of dating system whose purpose is to encourage people to meet a large number of new people.
Its origins are credited to Rabbi Yaacov Deyo of Aish Ha Torah, originally as a way to help Jewish singles meet and marry.