Why doesn’t Joker have a Prince Albert? Because that’s exactly what you’d expect and he’s all about confounding expectations.
[For the visually impaired: Pictured are seven villainous dongs. They belong to Joker, Magneto, Harvey Dent, Doc Ock, Carnage, Red Skull, and Thanos. Joker has a face tattooed on the end of his dick, with the meatus as the nose. Magneto shouldn’t do paperwork in bed, because his dick has attracted a bunch of paperclips. Doc Ock is mechanically enhanced for his partner’s pleasure.]