When the earth first moved: Fossil was first animal to have sex 570million years agoPosted: 2 years ago by AutumnLotus It may be more than 570million years old and look like a knobbly rope, but scientist believe they have discovered the first animal on earth ever to have sex. The fossilised remains of this new species of organism was unearthed in Australia where the tube-like creatures lived in abundant flocks. Comments: 1 Score: [-] 326 [+].