Aristocrats

Noble class believed to be breeding only between themselves and thus slowly degenerating.
They are the target of the famous "The Aristocrats" joke told by many stand-up comedians.
So the term can be used for people supposed to have pervert sex with their family members and family animals in the most disgusting ways one can imagine.

I hope there is no reincarnation. I wouldn't like to become the dog of those aristocrats living next door.

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