"There are exceptions for some educational, documentary, scientific, and artistic content, but only if that is the sole purpose of the video and it is not gratuitously graphic."
However, a YouTube spokesperson later told The Hollywood Reporter that the decision had been reversed, saying: "With the massive volume of videos on our site, sometimes we make the wrong call. When it's brought to our attention that a video has been removed mistakenly, we act quickly to reinstate it."
The video has now received more than 280,000 views.
The campaign for Lars von Trier's follow-up to Melancholia and Antichrist has been a raunchy affair, with photographs of sex scenes and a poster campaign showing each character reaching climax.
Shia LaBeouf sent the director a sex tape to secure his role in the production, telling chat show host Chelsea Handler: "I sent him videotapes of me and my girlfriend having sex and that's how I got the job."
Stacy Martin told The Independent earlier this year: "What scared me wasn't the nakedness but it was interacting naked. Shia was very professional but we didn't actually do anything sexual. That was left to the porn doubles. It's a totally different industry. The porn stars finish the job off for you. I never thought I'd meet my porn double."
Nymphomaniac will premiere in von Trier's native Denmark in December, and is expected to screen in Cannes, despite the director being banned from the film festival in 2011 after claiming he could "understand" Adolf Hitler.
- Independent