Students warned of man who exposed himself on Calvin University campus Updated Apr 10, 2021; Posted Apr 10, 2021 Facebook Share GRAND RAPIDS, MI – Grand Rapids Police are investigating after Calvin University students reported two incidents of a man acting in a “sexually inappropriate way,” a Saturday campus alert said. The first occurred near Hekman Library around 12:15 p.m. April 10. The man called a female student over to his car while he was naked and masturbating, according to Calvin University Campus Safety Department. The man next approached a group of students about 30 minutes later in the parking lot next to the Bunker Interpretative Center. He handed the students a note asking if they wanted to participate in a group sexual activity.