Who Started the First STD? (Spoiler: Not Humans.)

Everyone knows STDs are transmitted through sex… but have you ever stopped to wonder where the first STD came from? Who was that very first human that got infected — and how did it happen before modern travel, dating apps, or even civilization? In this episode, we trace the real origin story of sexually transmitted infections, from ancient skeletons to animal viruses that jumped into humans. Spoiler: it didn’t start with humans — and the truth is stranger than you think.