Drosophila pseudoobscura (image) University of Exeter Caption These are Drosophila pseudoobscura mating. A new study by the Universities of Exeter and Liverpool, UK, on these fruitfly suggests promiscuous females may be the key to a species' survival. Credit University of Exeter Usage Restrictions One use only - for use with this story. Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.