Rule 34.5.

↓ Transcript
Man: What's a safe-for-work version of Rule 34? Maybe replace porn with something else spicy?

Woman: We could make up a new rule 34.5 -- if it exists, there's pepper-spray of it.

Man: Nah, makes no sense.

Woman: I agree, that would be totally unlikely to ever happen.

Title: Rule 34.5.