devil's delicacy

The nickname for using bodily fluids or waste products that are usually not considered to be used in sex acts. However, some people are into getting their Red Wings, smearing a St. Louis Steamer, taking a Golden Shower, and so on.

Jeb: I don't think I'll play matchmaker for George anymore.
Neil: Why's that, Jeb?
Jeb: He's into some sick sexual stuff. There is not a waste product that comes out of a woman that he does not mix into sex.
Neil: So, his specialty is the devil's delicacy...