If you’re yearning for male birth control that isn’t a condom, you’re in luck! Scientists have been making progress on Vasalgel, a male contraceptive gel. A recent trial of the product on primates found the gel to be 100% effective at preventing pregnancy.
It’s pretty simple how Vasalgel works: the gel prevents sperm from exiting the penis. If a man decides he’d like to stop using the gel, the effects can be eradicated by using ultrasound waves to dissolve the gel. Vasalgel doesn’t affect “sperm levels or hormone production.”
Here’s how the study, conducted by scientists at the California National Primate Research, was set up:
For the study, 16 rhesus monkeys were selected to undergo the procedure before being placed back into groups with fertile females during mating season. After being monitored for six months, the researchers found that no pregnancies had occurred—the typical pregnancy rate in such unaffected conditions is usually around 80 percent.
Vasalgel isn’t the only contraceptive gel being tested right now. In India, reversible inhibition of sperm under guidance (RISUG) is being tested on men. This gel works differently in that it seeks to injure swimming sperm. RISUG has shown to be effective for up to 10 years within the 200 men on whom the product was tested.