Oh, but there's so much more!
I thought Incest was really well written (much like Lolita, where the content is filthy but you can't help but fall in love with the writer for how gifted he is with language), so I checked this one out next. Initially, Philosophy in the Boudoir came off as porn for the thinking man and nothing more - and really, everything has its place - but about halfway into the book there appeared some interesting philosophy that really completes some of what the Marquis got into with Incest. He further develops arguments on morality here, and if you're a Camus fan, a good deal of these arguments are actually pretty compatible with Camus, too. If you can get past (or enjoy?) all the anal sex bits, this is actually some pretty smart philosophy with what appears to be Marquis de Sade's characters debating either side of his own arguments.
Philosophy in the Boudoir: Or, The Immoral Mentors (Penguin Classics Deluxe Edition)
Philosophy of the Boudoir follows three aristocrats as they indoctrinate the fifteen-year-old Eugénie de Mistival in "the principles of the most outrageous libertinism." 200 years after de Sade's death, readers will continue to find shock and delight in
Philosophy in the Boudoir: Or, The Immoral Mentors (Penguin Classics Deluxe Edition) is one of best selling in Sexuality category.