Federal prosecutors reveal a Hillsboro man has pleaded guilty to enticement of a minor charges.  32-year-old Andrew Collins of the 200 block of Main Street entered his plea in federal court in Springfield Friday.  During change of plea proceedings before U.S. Magistrate Judge Tom Schanzle-Haskins, Collins admitted enticing a 16-year-old boy to engage in sexually explicit contact.   Prosecutors say in online chats, Collins persuaded the minor to engage in intercourse by offering monetary and nonmonetary gifts as well as a chance to live together in the future.  Collins faces anywhere from ten years in federal prison to life behind bars and a fine of $250,000.  The Secret Service and the Southern Illinois University Police Department played central roles in the investigation.