A groundbreaking (and taboo-breaking) work in sexology, Professor Richard von Krafft-Ebing's Psychopathia Sexualis (1886) is a series of case studies of various kinds of "sexual perversion".

While the subtitle makes it clear that the good Professor intended this as "a clinical-forensic study", and although his writing is moralistic, the modern reader is likely to find this a source of wonder at the infinite diversity in infinite combinations within human sexuality.

Serious collectors can still find the German original first edition for under $1000. Most sane readers, however, will prefer the English-language 1999 reissue for under $20.

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