Apparently, it works on rats. They don't know how exactly. I wonder it any man has yet volunteered for the process:
Armed with their new funding, the researchers now intend to find out the mechanism by which sperm are destroyed - thought to be a combination of heating and shaking. "We also need to know the minimum effective dose and track how long the effect persists," says Tsuruta."The idea in people is that the testes would be in a little cup of water, or another liquid that ultrasound can be transmitted through," Tsuruta says.
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