Fantagraphics has recently published just such a volume. It's called nEuROTIC and it can be ordered directly from Fantagraphics, from Amazon.com, or through your local bookstore.

You could always hedge your bets by first reading a description or a review — that's what I would do.

Here's one of each.

From Fantagraphics:
A dirty picture is worth a thousand dirty words. Like Emily Dickinson, master illustrator John Cuneo has spent years generating a huge oeuvre of work that has never been publishedÖ anywhere. Unlike Ms. Dickinson, however, Cuneoís consists of stacks and stacks of weird, perverse, erotic, hilarious, and disgusting images delineated in his sketchbooks. But make no mistake these full-color sketchbook drawings are as lushly finished as his prize-winning illustration work for such magazines as Esquire (where he illustrates the sex column), Rolling Stone, Mother Jones, Entertainment Weekly, and The Atlantic. nEuROTIC is a sharply designed little full-color hardcover that collects the very best of Cuneoís humorous erotica.

From Eye on Comics (for full review click here):
This book ó not a graphic novel, really ó is a sketch collection of unpublished artwork by noted U.S. cartoonist John Cuneo, whose recognizable style has appeared in a wide variety of publications, from the cerebral New Yorker to the more accessible Entertainment Weekly. Itís an interesting look inside the mind of a creator with a twisted bent. Cuneoís work will seem familiar, and this book allows him to cut loose and transgress the taboo. To say nEuROTIC is pornographic is completely off the mark, though. This book does not titillate. Itís occasionally depraved, sometimes challenging and often funny. This is a coffee-table book for those who delight in shocking people, who see offending material as a means to enlighten rather than frighten.