Insect Inside / Powerpuff Bluff - S1-E1
Trivia: In "Powerpuff Bluff", Dexter makes a cameo appearance when the kindergarten kids have a nap time.
The Powerpuff Girls Best Rainy Day Adventure Ever / Just Desserts - S2-E10
Trivia: The professor drives off to the store with his blindfold on.
Boogie Frights / Abracadaver - S1-E5
Trivia: The scene of the Powerpuffs flying along the disco ball is parodied of a scene of Star Wars (episode IV). Note the PPGs having to shoot one area to explode the ball.
Answer: A representative for the broadcast company refused to say why, only that it was the "content" of the episode. A search of the term 'rowdyruff' on a search engine returns a multitude of XXX related sites. Perhaps this may lean to an explanation.
Macalou