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Dr. Iwan Bloch

Bloch, "the father of sexual science", took his medical degree from Wuurzburg in 1896 and soon published his Ursprung der Syphilis (1901), which made him the foremost exponent of the so-called Morbus Americanus theory that syphilis originated in America. His Beitrage zur Aetiologie der Psychopathia Sexualis was an important follow-up of Krafft-Ebing, and several other works brought him recognition as a pioneer sexologist.