A man from Bangor accused of sex crimes against two children pleaded not guilty Tuesday. 27-year-old Terrence Pinkham is charged with five counts of gross sexual assault and two counts of sexual exploitation of a minor.He and 27-year-old Katie Dube of Glenburn were arrested last month in Brewer. Police say they found child pornography on an electronic device involving a boy under the age of 12. Authorities say someone forwarded the graphic photo to them.Deputy District Attorney Mike Roberts says one of the counts of sexual exploitation involves a second alleged victim, an underaged girl. Pinkham remains in jail on $100,000 bail. Dube, who faces the same charges, is scheduled to be arraigned next month.