Related Clues:

• Must shift stain
• In recession corporations producing coarse material
• Cereal and other crop disease marked by powdery black spores
• Bit of dirt, stomach's upset
• 'Not safe for work' stuff
• Black mark getting start of the sum wrong
• Stomachs turned by dirty joke
• Time to interrupt famous symphony: it's saucy stuff!
• Business's ending belly up, getting black mark
• X-rated reading material
• X-rated writing
• Sexy literature
• Steamy literary genre