Researchers Say Fish Fossils Reveal the Earliest Known Erection

Prehistoric fish had sexual reproduction figured out 380 million years ago, a new fossil study has confirmed. Researchers examined the fossil of one species of armored placoderm fish and realized that the fossil showed a 2-inch-long embryo within the fish's body cavity, indicating internal fertilization, or sex as we know it. Palaeontologist Zerina Johanson says: