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 2016 Health of the Nation Survey 2016-11-14 09:34 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 News 2016 Health of the Nation Survey Medical Excessive sweating linked to anxiety and depression Medical Fast-growing HIV epidemic in Philippines Medical Breast cancer prevention drug no use beyond 5 years Lifestyle Injectables: Fact vs. fiction Parenting Baby teethers in US contain bisphenol-A From our sponsors Sun protection for all children Understanding your sunscreen The science behind cosmeceuticals Do you know these 5 facts about skincare? Live healthier The debate continues » Working out in the concrete jungle 7 top butt exercises for guys 10 things pole dancing can do for you The running vs. walking debate There are many different theories when it comes to the running vs. walking for health and weight loss. Veganism a crime? » Running the Comrades Marathon on a vegan diet Are vegans unnatural beasts? Can a vegan be really healthy? Should it be a crime to raise a baby on vegan food? After a number of cases of malnourishment in Italy, it may become a crime to feed children under 16 a vegan diet.