In the fourth season of the Showtime hit, the 14-year-old son of Mary Louise Parker’s freewheeling mom brought home two Goth girls with one thing in mind. To prepare for their wild night together, Simone and Harmony research sexual positions on the Internet, but it’s young Shane who gets cold feet. After being egged on by his older brother, Shane retreats to the fate of his bedroom, but in true jailbait-and-switch fashion, the show cuts away. The threesome is seen sleeping the next morning, and the following season Shane has an STD scare from his night with the Marilyn Manson fans. Turns out his health issue is the result of a very rare male yeast infection. Reality bites. Sonja Flemming, SHOWTIME / Everett Collection Apparently, the creators of the revamped Knight Rider didn’t believe the show could succeed on the strength of its writing. The short-lived 2008 series was developed after a much-hyped television movie proved there was still an audience eager to watch talking cars. And what better way to premiere a show—and position its protagonist as a true hero—than have its handsome leading man (Justin Bruening) prove his sexual prowess with not one, but two women in the series’ opening moments. Alas, Bruening was no David Hasselhoff—the new Knight Rider was canceled after one season. Mitchell Haaseth, NBC / Everett Collection The original television threesome was actually the tamest—save for the witty innuendo lobbed between roommates played by John Ritter, Joyce DeWitt, and Suzanne Somers. Because it appeared in bad taste if men and women lived together, Ritter’s character Jack had to pretend he was gay, and that thin premise propelled the series through eight very popular seasons until its John Ritter-centered spinoff— Three’s a Crowd. Everett Collection