Jewelry Boutique

I am writing a erotic story where the Catholic Church is engaging in covered up sexual activities. I want to have a symbol to be used to identify this cover-up. Can anyone point the way to some less common symbols (i.e. not the fish, the cross, Chi-Rho) that might be possible to use in this way? Ideally I would like this symbol to be something that could be displayed openly (i.e. on a ring, tie, clothing, tattoo, etc) by someone of either gender and any age range(Parent, Children, Singles). It also should be something that doesn't openly point at the Church or to sex, and won't totally stand out if a several people were in an area together with the symbol. Any thoughts on what I can use for the story?