Vasalgel Success (IMAGE) Parsemus Foundation Caption A study in monkeys proved the effectiveness of Vasalgel as a non-hormonal male contraceptive. No pregnancies occurred in the social groups of 16 male rhesus macaques given Vasalgel. The device produced fewer complications than vasectomy. Credit None. 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.