Published: Jun 08, 2012 7:17 PM EDT

SANIBEL, Fla.- Sanibel Police arrested a 60-year-old man for allegedly masturbating on the beach in front of a 15-year-old girl.

The victim reported to police that while she was walking on the beach, she saw Johnathan Muller sitting in a beach chair, masturbating behind a book. Unsure of what she saw, the 15-year-old passed the man again, and again witnessed the same behavior.

She reported the incident to her father.

The victim was able to identify the man, still in his beach chair, when police arrived. Muller insisted that he had not been masturbating.

The teenager was able to accurately describe what she saw to the officers and was visible upset by the event.

Muller was charged with lewd and lascivious behavior with a victim under the age of 16.