Vasalgel Male Contraceptive (IMAGE) Parsemus Foundation Caption Vasalgel is being developed as a long-acting, non-hormonal, reversible male contraceptive. It is a polymer gel that is injected into the vas deferens to block the flow of sperm and create a long-lasting contraceptive effect. Credit Parsemus Foundation Usage Restrictions Image may only be used with appropriate credit. 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.