AFRICANGLOBE - Former IMF chief Dominique Strauss-Kahn denied knowing that prostitutes were involved in sex parties he joined, as he took the stand Tuesday for the first time in his high-profile trial on pimping charges. The trial of Strauss-Kahn, who saw his career plummet to earth after a separate sex scandal that resulted in his arrest in New York in 2011 for raping a Black woman, opened in the northern French city of Lille a week ago.