How Vasalgel Male Contraceptive Works (VIDEO) Parsemus Foundation This video is under embargo. Please login to access this video. To view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 video Caption This animated 3-D video illustrates how Vasalgel is implanted into the vas deferens where it blocks sperm flow. Then Vasalgel is then flushed out so that sperm flow is returned. Credit Parsemus Foundation/ animation by Filip Spasev and Will Justice 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.