Related Clues:

• No-no on office computers
• X-rated stuff
• Popular website genre
• Smutty material
• Dirty work?
• Refuse to clean up
• Feelthy stuff
• Files downloaded to a hidden folder, perhaps
• X-rated material
• Gross income source?
• Serious grime
• It's NSFW material (unless your store sells it)
• Foul matter
• Disgusting dirt or obscenity
• Real dirt or obscenity