A Chippewa Falls man is being held in the Washington County Jail on charges of sexual assault and using a computer to facilitate a child sex crime. The man’s name hasn’t been released. He met a 12-year-old girl on social media and drove to West Bend to have sex with her. He got in trouble when the girl told someone she was “dating” a 20-year-old man. The investigation was prompted March 10th by a call from the adult the girl had told about it.