A woman appeared in court in Denver, Colorado in January 2012, charged with felony criminal mischief after punching and scratching a painting at the recently opened Clyfford Still Museum.
She also rubbed her buttocks on it after pulling her pants down.
Carmen Tisch was also reported to have urinated after rubbing against the canvas, but tests had not yet confirmed whether urine had got on the painting.
Clyfford Sill was an abstract impressionist who died in 1980.
The painting that was the subject of the police report was called "1957-J no. 2" and has been valued at $30 million.