Possible Clues:

• 'The gentleman talked ---, the ladies laughed and we were angry' (Oliver Goldsmith, Citizen of the World)
• Erotica, less generously
• Stomach's rejecting sooty matter
• Explicit stuff
• Dirty magazines and such
• Point to virtually dumb filth
• Federal Communications Commission target
• Indecent items or talk
• Filthy matter
• Stevenson made up tale in which preliminary matter is black spot