New research suggests that Syphilis was intelligent enough to evolve as a disease -- from a skin ailment to a sexually transmitted virus, more likely to be passed among humans in Europe's frigid climate (where skin contact was rare.)16th century accounts of Syphilis describe it as causing painful, oozing boils - not the kind of thing you'd get laid with, and therefore not beneficial to Syphilis's survival. So, it evolved into the infertility- and insanity-causing Syphilis of today.
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