The Revolutionary New Birth Control Method for Men
The procedure is known by the clunky acronym RISUG (for reversible inhibition of sperm under guidance), but it is in fact quite elegant: The substance that Das injected was a nontoxic polymer that forms a coating on the inside of the vas. As sperm flow past, they are chemically incapacitated, rendering them unable to fertilize an egg.
Wow, this is pretty awesome. Could be a game changer for guys.