Justin Timberlake and Mila Kunis convinced director Will Gluck to rewrite the script for Friends With Benefits as a sex-fuelled romantic comedy after learning it was originally planned as a family-friendly movie.
The co-stars play pals who agree to embark on a no-strings-attached intimate relationship, but the singer-turned-actor reveals the plot was originally very different - because studio bosses were aiming to please film censors and gain a Pg-13 rating to appeal to a wider audience.
However, Timberlake and Kunis agreed the story should be all about sex, as the title suggests, so they spent weeks working with Gluck to give the story a complete overhaul.
Timberlake tells Vanity Fair magazine, "It was originally supposed to be a Pg-13 movie. That was crazy to me. How do you make a movie called Friends With Benefits and not embrace the title."
The movie, set for release in July (11), has yet to be given an age rating by officials at the Motion Picture Association of America, but is expected to receive a more restricted rating as it includes a nude scene featuring both Timberlake and Kunis.