[cnn-photo-caption image=http://i2.cdn.turner.com/cnn/2009/images/10/02/art.david.letterman.cbs.art.jpg caption="David Letterman on Thursday revealed an extortion attempt based on his sexual relations with staff members."] NEW YORK (CNN) – "Late Show" host David Letterman acknowledged on his show Thursday night that he'd had sexual relations with members of his staff and that he revealed those liaisons during grand jury testimony for a … Continue reading Letterman reveals affairs with staff, extortion attempt