about satanic symbols and the Catholic Church*, but these guys aren't.  According to the documentary Rape of the Soul, images embedded in Catholic art exert a subliminal influence that leads to "deviant sexual behavior."  Says writer-producer (and devout Catholic) Michael Calace,

Artists from DaVinci to Botticelli have embedded subliminal images into their art for centuries. . .  In this case we found penises on crucifixes, anarchy symbols, swastikas, demonic faces and in modern works even the word 'sex' encrypted into the images. The works in question include modern artists' work currently on the covers of missalettes and hymnals that at this very moment sit in the pews of churches throughout the U.S. and on children's religious teaching aids.

Folks familiar with the history of such claims will recognize one of the experts quoted in the film:  Wilson Bryan Key.  In the 1970s, Key wrote a series of books exposing subliminal sex messages in ads and art.  Key's most well-known work is Subliminal Seduction; had he stopped there he might have enjoyed more long-term influence, but the sequels Media Sexploitation and The Clam Plate Orgy often bordered on self-parody, if not bizarre obsession. 

Plus ca change .  . .

*The upside-down cross is not only used in satanism, but is also a visual reference to St. Peter, who according to tradition was crucified upside-down.