The 9th Annual Masturbate-A-Thon (NSFW)

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World Champion Masanobu Sato flew in from Japan for the event, where he attempted to beat his...
World Champion Masanobu Sato flew in from Japan for the event, where he attempted to beat his own record from last year of 9 hours and 33 minutes. When the event officially started at 3:00, Sato had already been busy for nearly five hours.

The human behavior usually confined to the private bedroom made a semi-public appearance on Saturday, May 2, at the 2009 Masturbate-A-Thon -- held at the Center for Sex & Culture on Mission Street. Photos by Lauren Smiley. UPDATE: See our interview with masturbating champion Masanobu Sato.

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