Researchers at the University of North Carolina at Chapel Hill have found via animal testing that zapping the testicles of rats with a therapeutic ultrasound machine can get rid of the germ cells used to produce sperm. "This caused rat sperm counts to fall far below the [equivalent] range seen in normal fertile men, and this happened in just two weeks," said James Tsuruta, assistant professor of pediatrics in the laboratories of reproductive biology at UNC Chapel Hill. "This method dropped sperm counts 10-times lower than just using heat," said Tsuruta. "It's going to be exciting to figure out how this exactly works: if it's safe to use repeatedly, how long it lasts, and if it's reversible." Scientists believe this study could pave the way for a new method of male contraception, but have discouraged women from electrocuting their beaus’ balls with or without consent at least until clinical trials have begun.