Cooperative Evolution (IMAGE) Osaka University Caption This is the hypothesis of cooperative evolution between mating position and male genitalia rotation. Red indicates male genitalia and blue indicates female genitalia. Credit © Inatomi M. <i>et al. </i>(2019) <i>Scientific Reports</i> 9:210 Usage Restrictions None License Licensed content 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.