Sexual Nature 1/3

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<p>The oldest known sexual beings, a 400 million year old fish sex movie and the prehistoric turtles which were fossilised in the act of copulation. Discovery this week is strictly adults-only as we begin a three-part natural history of sex. Adam Rutherford talks to the scientists studying the world’s most revealing fossils. </p><p>(Image: Two carettocheylid turtles, fossilised in mating position. Credit: The Royal Belgian Institute of Natural Sciences)</p>