A stash of explicit pornography to which Franz Kafka subscribed has emerged for the first time after being studiously ignored by scholars anxious to preserve the iconic writer's saintly image.

Having stumbled by chance across copies in the British Library in London and the Bodleian in Oxford while doing unrelated research, James Hawes, the academic and Kafka expert, reveals some of this erotic material in Excavating Kafka, to be published this month. His book seeks to explode important myths surrounding the literary icon, a "quasi-saintly" image which hardly fits with the dark and shocking pictures contained in these banned journals.

Their additional significance is that the publisher, Dr Franz Blei, was also the man who first published Kafka in 1908 - a series of miniature stories later gathered in his book Meditation.

Hawes, an Oxford graduate and university lecturer, emphasises his total admiration for the literary Kafkaesque genius who wrote brooding classics such as The Metamorphosis, The Castle and The Trial, and argues that these discoveries merely show Kafka as more human than the popular image. He believes that "suppressing" them detracts from sensible assessment of his work, and has even led to nonsensical evaluation.

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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."

"Academics have pretended it did not exist," Dr Hawes said. “The Kafka industry doesn’t want to know such things about its idol."

He added: "Perhaps Kafka's biographers simply don't like the idea that their literary idol was helped out in this... way in the vital early stages of his career... Of the world's authors, only Shakespeare generates more PhDs, more biographies, more coffee-table books... Everything Kafka wrote, every postcard he ever sent, every page of his diary... is regarded as a potential Ark of the Covenant... Yet no-one has ever shown his readers Kafka's porn."

The journals' title - The Amethyst/Opals - reveal nothing about their contents, but Kafka kept his collection locked at his parent's house where he lived, taking the key with him when he went on holiday.

Perhaps he feared his father Hermann. But the obsession with a supposed brutal father and with being a Jew, are two other myths which Dr Hawes challenges. Hermann, a conventional Jewish businessman and ex- sergeant-major in the Hapsburg army, was probably "a father of his time", may indeed have been stern, but Dr Hawes - who is also senior lecturer in creative writing at Oxford Brookes University - argues that Kafka admits that he "hardly if ever actually hit" him. He also let him study what he wanted, live at home rent-free for years, when Kafka earned handsomely, and come and go "as he pleased".

As to the myth that Kafka's works are based on his experiences as a Jew in Prague, and that Kafka somehow predicted the Holocaust, Dr Hawes acknowledges that Kafka was very much aware of being Jewish. But "there is zero actual Jewishness" and no Jewish characters or scenes in his work. He was immersed in German culture.

Dr Hawes's biography also challenges the enduring popular portrait of Kafka as a tortured and lonely figure, neglected in his own lifetime, stuck in a dead-end job and struggling to write. The true Kafka could not have been more different, he said, describing him as a popular and well-paid state lawyer whose writing was supported by a prominent literary clique. It was only towards the end of his short life in 1917 that TB was diagnosed, and his poverty only occurred near the end due to economic collapse after the 1914-18 War.

Commenting on the book's discoveries, Ritchie Robertson, a professor of German at Oxford University and author of Kafka: A Very Short Introduction, said he was unaware of any academic actually looking at the pornography pictures, let alone reproducing them for biographies, even though they knew of his subscrition to Amethyst/Opals.

He added: "The many myths about Kafka circulating among the semi-informed public... do include the idea of Kafka as a kind of saint, originally propagated by his friend Max Brod. So it's salutary to assemble evidence that he was human."

Kafka's interest in pornography, which left traces in such works as The Metamorphosis, matters if it makes us look at any of Kafka's fiction in a new way, he said: "Kafka had a strongly visual imagination, and the importance of the visual arts for him hasn't yet been fully explored."

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