What is the author's style in The Bedroom Philosophers by Marquis de Sade?

The perspective underpinning the works of the Marquis de Sade in general - and the Bedroom Philosophers in particular - is problematic for the modern reader. His work invariably deal in sexual perversions, some innocuous, most criminally vile. His words are lilting and playful, but his characters seem to act without any sense of irony; there is no wink behind these hideous actions.