Franz Kafka’s porn brought out of the closet
entertainment.timesonline.co.uk
entertainment.timesonline.co.uk
There was an interesting NYRB article a few weeks ago that said similar things about the myths around Kafka that mostly came from Brod (http://www.nybooks.com/articles/21610).
There's a famous story of Kafka reading his stuff to friends and laughing so hard that he couldn't continue. It seems he was more a comic writer than people think, and your reaction might not be so far off.
It's fascinating how creations come to be inseparable from the filters (e.g., Kafka as prophet of modernist despair) built up by others after the fact.