Home > News Updated 23 October 2014 How sex was invented Scientists have unveiled how the first sex on earth happened, and it wasn't pretty. 25 Placoderm from Shutterstock ~ Once upon a time there was a daddy placoderm and a mummy placoderm, and they liked each other a lot. So, one day, these two placoderms stood next to one another and had sex, and it was the first time sex as we (tangentially) know it had happened on planet Earth. Few similarities to human sexThis is what scientists announced this week following a detailed analysis of fossils discovered in as geographically unaffiliated destinations as Scotland, China and Estonia, said the paper which was published in Nature. The animals in questions lived not in the sea, but in lakes, and existed around 380 million years ago. Mankind earliest ancestor was believed to have lived only 1.8 million years ago.The logistics of the coupling bore very few similarities to human sex. Firstly, the animals did not face each other or approach "doggy style" from the read. Instead, the animals floated side by side "as if they were square dancing."As for genitals, they were to be found at the bottom end of the organism, where the feet would be on a human. The male had a pair of claspers, long, rigid, L-shaped appendages. The female had genital plates which formed a small area on her backside.These genital plates were described in the paper as being like a cheese grater. This rough texture would cause the male claspers to get locked in place and allow the transfer of sperm to commence.Read: Nutrition improves sperm quality Strangely, over time fish seem to have lost the ability to have sex this way, with eggs being fertilised inside the body of the female. Modern fish release eggs and sperm into the water where they are then fertilised, outside of the body. Why this happened remains a mystery to scientists, reports Vox. Read more:The rampant sex lives of animals Well-fed sperm are happy sperm New animal literally sexes itself to death Image: Placoderm from Shutterstock Harry Phillips NEXT ON HEALTH24X Floater alert: Here’s what it means if your poop floats 2018-01-20 08:06 More: News advertisement Read Health24’s Comments Policy Comment on this story 25 comments Comments have been closed for this article. Logout Comment 0 characters remaining Share on Facebook Loading comments... Other news Lifestyle Floater alert: Here’s what it means if your poop floats News 35 women fall pregnant despite using contraception app News 5 diseases you risk getting if we run out of water Lifestyle 5 photos of your cervix you need to see Fitness 4 sprint workouts to help you get faster News QUIZ: How many of these random health facts do you know? From our sponsors Managing diabetes in the workplace Back-to-school with diabetes Discover treatments that can help reduce acne What can I do to reduce or remove acne marks? Live healthier Terrific Tea! » Rooibos makes cocktails healthier Rooibos: an alternative energy drink More than 10 reasons why rooibos is good for you Today marks the first annual National Rooibos Day, which aims to raise awareness of the health benefits and many uses of rooibos tea. Healthy? Are you sure? » 5 diseases we can get from animals Could your salon visit make you sick? 7 terrifying diseases you could have without knowing it Not all serious illnesses come with tell-tale symptoms. There are diseases that can turn your body into a ticking time-bomb while you're unaware of any danger.