Graynor told The Huffington Post that the sex line-themed comedy is actually a "fresh" tribute to female friendship rather than an erotic comedy.
"I loved it from the second I started reading the script," she explained. "It was so fresh and it was so mind-boggling to me that there are not more movies about female friendship.
"Being women, your friends are such an enormous part of your life, and it's been such a void for movies - especially in the last 10 or 15 years."
Graynor went on to reveal that For A Good Time Call reminds her of several female-centric 1980s comedies.
"This movie has a bit of a nostalgic feel back to some of the '80s movies we all loved with Shelley Long, Goldie Hawn, Bette Midler, Diane Keaton and Lily Tomlin; that culture of movies with really strong yet vulnerable women involved in stories that were not fully about getting the guy," she said.
Graynor continued: "I thought that [writers] Lauren [Miller] and Katie [Anne Naylon] did such an incredibly smart thing by subverting the romantic comedy and using it as a friendship love story instead.
"Then the setting of the phone sex was such a clever, naughty, delicious piece."
For A Good Time Call… is now playing in the US and opens in the UK on November 2.
Watch a trailer for the film below: