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O was the name of an international fetish magazine published in Germany by Peter W. Czernich (No. 1 - 24). It was published both in German and English. The last issues, O No. 25 and 26, was published by Ron Mayer. O magazine was followed by Marquis magazine.
The name comes from the French sadomasochistic novel Story of O.
The magazine was notably in a trademark dispute with Oprah Winfrey and Hearst Magazines over their O: The Oprah Magazine title.