Metallica's James Hetfield has lent his voice to the narration of Addicted To Porn: Chasing The Cardboard Butterly, a new documentary.

Hear some of Hetfield's voice-over in the clip below.

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Directed by Justin Hunt, Addicted To Porn presents a “unique, controversial film dissecting the issue of pornography, its effect on society and how it's perceived around the globe,” according to the movie's producers.

The film is now available on digital outlets like iTunes and Vimeo.