It's so appallingly obscene that you must come and see it immediately!

From the introduction to Rosamond Culbertson's Rosamond: Or, a Narrative of the Captivity and Sufferings of an American Female under the Popish Priests, in the Island of Cuba... (1836):

...No further proof of the moral corruption of the Popish Clergy in the island of Cuba, need be exhibited, than these very letters. The superscription of two of them, of which we have given a partial fac-simile, shows that the Reverend writer had bid adieu to the last vestiges of modesty. His letters terminate with "Fugo," "I fly." Well, indeed, may he have intimated, that his passions had taken the wings of audacity, and transported him into the blackest, foulest regions of libidinous excess!—A blank in the fac-simile, marks the absence of what, in the original, would raise a blush on immodesty herself. We have to suppress it. The indecency of the dotted thing, is so lasciviously abominable, that the exhibition of it before the public, would be an outrage upon modesty, that no motive, however pure or laudable, could sanction. Those, however, who are curious to see to what extreme pollution Priestly celibacy leads her captives, can be favored with the revolting sight, by calling at the office of the "DOWNFALL OF BABYLON," No. 131 Nassau-st. New York.  (11-12)

The links between anti-Catholic propaganda and pornography are often overstated--surely anyone reading Maria Monk for titillation would be sadly disappointed--but this publisher certainly pulls out all the stops here.