Well, "disgusting" doesn't refer to the books but to the subjective reaction of the person making the complaint. I don't think that anything is disgusting per se. These words "disgusting" and "filthy," etc., have prevented us from undertaking any scientific experimentation in sexual matters.

Burroughs Live: The Collected Interviews of William S. Burroughs, 1960-1997 (ed. Semiotext, 2001)