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The two 18-year-olds were in the nudist area of the lawn around 5 p.m. when the stranger masturbated in front of them. When the women approached him, he left before the police arrived. The search was unsuccessful. The man is described as being around 60 years old, around 1.70 meters tall and of slim build. He has few gray hairs and suntanned skin. The Tübingen police station is investigating.