Shankman, who directed the episode, told TV Guide that a number of changes have been made for the show.
The programme focuses on New Directions as they stage a production of The Rocky Horror Picture Show. However, Will (Matthew Morrison) and Sue (Jane Lynch) clash over whether the musical is suitable.
"[The Rocky Horror characters] become a haven for outcasts," Shankman said. "It was like this big party for misfits, so it's perfect for the glee kids because they all feel like misfits. They're the pariahs of the school. Glee club is that haven for them."
Mercedes (Amber Riley) will play Dr. Frank-N-Furter, meaning that the character is no longer a transvestite, and Sam (Chord Overstreet) stars as Rocky but it is not clear that he was created as a sex object. Meanwhile, Finn (Cory Monteith) and Rachel (Lea Michele) play Brad and Janet, but neither of them have sex with Rocky.
Shankman suggested that Glee's executive producer Ryan Murphy asked him to direct the episode because he would be able to tone down Rocky Horror, saying: "Everything I touch turns 'family', no matter how risqué it is."
Shankman also revealed that he found a way to make 'Touch-A Touch-A Touch-A Touch Me' less controversial, explaining that Will and Emma (Jayma Mays) perform the song.
"It becomes okay because of who's doing it," he said. "Emma this season is exploring her boundaries, so there's context. Also, I'm not staging it with his hands on her boobs. She's not in a bra. It becomes fine."
The Rocky Horror Picture Show episode of Glee airs tonight at 8/7c on Fox.