Karl Wildermuth, from /*Uniondale*/, was arrested in the /*Hofstra University*/ library Tuesday afternoon.
Public safety officers say Wildermuth sat behind a female student while touching himself.
Wildermuth was banned from the library more than a decade ago after he grabbed a young woman.
And in 2009, police said Wildermuth entered the college library and grabbed and squeezed a female victim on the buttocks.
Wildermuth is charged with two counts of Burglary 3rd Degree, Forcible Touching and Public Lewdness.
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