Excavating Kafka 
<http://www.amazon.co.uk/exec/obidos/ASIN/1847245447/downandoutint-21>, 
a new book by James Hawes, includes (for the first time) material 
gleaned from Kafka's hardcore porn stash, booklets that were published 
by the same publisher who published Kafka's own work.  Even today, the 
pornography would be "on the top shelf", Dr Hawes said, noting that his 
American publisher did not want him to publish it at first. "These are 
not naughty postcards from the beach. They are undoubtedly porn, pure 
and simple. Some of it is quite dark, with animals committing fellatio 
and girl-on-girl action... It's quite unpleasant."
Via http://www.boingboing.net/2008/08/09/kafkas-porn-stash-go.html

