Related Clues:

• Censors go after it
• Film genre with plumbers, plumbing entendre, and then just fucking
• Target of obscenity laws
• Larry Flynt concern, briefly
• Body art?
• Gross income source?
• Racy reading
• Movie genre that usually takes place in one room
• Offensive lines?
• Net Nanny no-no
• A lot of online content
• Blue literature
• It's NSFW material (unless your store sells it)
• Unlikely section in a religious bookstore
• Carbon black