The Divers Genitaliae of the Lizard-Folk

The Divers Genitaliae of the Lizard-Folk (full title, The Divers Genitaliae of the Lizard-Folk; all Provocative and Discursive Notes and Diagrammes Left Compleat and Unexpurgated, with Novel Engravings of a both Titillating and Educational Nature is a biological codex traditionally attributed to First Cosmopolitan Age scholar Reptilicus, although modern philologists generally believe that it was written by a distinct author to whom they refer as "Pseudo-Reptilicus."

The codex was for many years treated as the authoritative source for mammalian humanoids on the Lizard People of the Hinter-fens. Although the document contains a great deal of useful and accurate medical and anthropological information about the Lizardfolk, its rather prurient editorial style and many visual and literary depictions of the lizardkin mating process earned it a reputation as pornography among later, more conservative scholars. In magical and clerical libraries the book was typically relegated to a restricted section, granting it an almost mythical status as an erotic desideratum among young adepts and acolytes.