The film was initially set to have a tamer PG-13 rating, but Timberlake and director Will Gluck had a different idea.
"He and I collectively went to the studio and said we think if you guys are brave enough, we'd like to make this an R rating, so that we can embrace what's more real and awkward and funny," Timberlake.
Patricia Clarkson plays Kunis' mom. She said she appreciates the freedom that comes along with an R rating.
"I think the real water cooler topics will be some of the frankness that Will Gluck has put on film between two people who are lovers," Clarkson said.
