In regards to the Audi comment.
I could swear I saw it on an Audi with personal plates that read RLANGDON.
This may also be where the reference to devil worship was mentioned. What they probably meeant was pagenism.
In that respect you could try something with multiple triangles (chalice in cups) forming a xxx to signify the sexual aspect.
http://mtheoryit.com/swngr.jpg