Vial filled with semen (IMAGE) KTH, Royal Institute of Technology Caption A semen-filled vial that was used in the study. Credit Ulrike Schimpf Usage Restrictions Credit must be given to the creator. License CC BY 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.