Possible Clues:

• 'Don't let your boss catch you watching this' acronym
• "Click this link at your own risk" letters
• Like vulgar videos at your day job, for short
• Brief warning about the links?
• Brief warning accompanying a link
• Warning letters next to a link
• You might be careful opening something with this label
• (Warning: Explicit content)
• [This is unsuitable for office viewing]
• "Don't open in the office" letters