Married couples - advice needed on Catholic symbol for sex story?

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) 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 or marital status. 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. Asking Married folks as you are more likely than Singles %26amp; Dating crowd to read erotica.Married couples - advice needed on Catholic symbol for sex story?
how about two rings overlapping each other with thorns someplace on it or maybe through it. Just a thoughtMarried couples - advice needed on Catholic symbol for sex story?
The ';CHI RHO';...google it....