Don't Worry. You Won't Feel a Thing

Scientists may have discovered a new form of male birth control, which the media is calling the "testicular zap!"

According to the BBC, the ball zap is currently available only to rats - no human trials yet. Scientists put rodents in warm salt water and then fired ultrasound at their testicles — like a testicular ray gun. Success? Kind of. The zap reduced their sperm count to less than 10 million sperm per milliliter (which would be considered "sub-fertile" in humans).

However, researchers still aren't sure if the zap will damage sperm or fertility permanently, or if it could lead to birth defects in subsequent kids.

And of course whenever there's a discussion of male birth control method, there is also discussion about whether or not men will be willing to use it. Unlike women, men aren't used to the idea of modifying their body chemistry as a method of birth control. Especially if it involves zapping. Or needles (men in India already have access to an effective reversible birth control, in the form of a shot to the scrotum). Which would you prefer? :)