The Dutch novel title Pijpelijntjes works as a double-entendre.

Evidence

Pijpelijntjes, which can be translated as “pipelines,” refers to a seedy area of Amsterdam where utility pipes are overground. It also is a pun: pijpen is the colloquial word in Dutch for performing fellatio. — Ivan Davidson Kalmar, Derek Penslar, Orientalism and the Jews, 444

Categorization

• CANDY: Fun linguistic tidbit about a wordplay-laden Dutch book title.