Stephen King, one of the greatest novelists of the 21st century, opened up about the popular novels “Fifty Shades of Grey” and “Twilight” -- and his thoughts about the erotic book and vampire love story might be surprising to some. During an interview with the Guardian, the so-called King of Horror, 66, admitted to reading both of them, but not continuing to read subsequent entries in either series. Not too shockingly, the author was generally unimpressed.

“I read ‘Twilight’ and didn’t feel any urge to go on with her,” King said of Stephenie Meyer. “They’re really not about vampires and werewolves. They’re about how the love of a girl can turn a bad boy good.”

While King deemed “Twilight” “tweenage porn,” he said that “Fifty Shades” wasn’t “mommy porn,” as it has widely became known. “I read ‘Fifty Shades of Grey’ and felt no urge to go on. They call it mommy porn, but it’s not really mommy porn.” The author of “The Stand” observed that it’s meant to appeal to a younger generation: “It is highly charged, sexually driven fiction for women who are, say, between 18 and 25.”

“Fifty Shades” author E.L. James was reportedly inspired by “Twilight” to write her own series, and, following in her predecessor’s footsteps, a film adaptation of the erotic novel will hit theaters next Aug. 1.

Fans of the “Fifty Shades” series have had a general disdain for the actors chosen to perform as James’ beloved characters Christian Grey, who will be played by Charlie Hunnam, and Anastasia Steele, who will be played by Dakota Johnson.

Hunnam, who was previously best known for his work on the FX series “Sons of Anarchy,” reportedly needed extra security at the show’s premiere after it was announced he would be starring in the love story encompassing bondage, discipline, sadism and masochism.

The official trailer for the movie will supposedly air on Super Bowl Sunday.