Guys, while you're waiting for that miracle contraceptive shot to make its way to the U.S. from India, you might want to try taking your testicles to a really loud ultrasonic concert, since according to a new study, ultrasonic blasts might lower your sperm count enough to make you temporarily infertile.
According to a study on rats published in Reproductive Biology and Endocrinology, if you fire ultrasonic sound waves at a man's fertile crescent the sound pressure will "significantly reduce" the number of sperm as well as the cells that produce sperm. Two 15-minute doses of ultrasound (administered two days apart and in warm salt water) were enough to drop the sperm count of rats to under 10 million sperm per milliliter. This still sounds like a heck of a lot of sperm to me (when hypothetically all it takes is one to get the job done) but, apparently men are classified as "sub-fertile" when their sperm count drops below 15 million sperm per milliliter.
More testing needs to be done on this technique, of course, to see how long it's effective for and whether there are any long-term side effects (especially if you keep coming back for more treatments). But the advantages are that it can be performed inexpensively with equipment that doctors already have, and unlike hormonal birth control, it doesn't require taking a pill every day, just a visit to the doctor every couple months.
We here at DVICE would like to reiterate to all you crazy kids out there that more testing needs to be done on this technique, so regardless of how awesome of a boombox you might happen to have in your bedroom, please DO NOT TRY THIS AT HOME.