Last January, an Australian engineer announced a bizarre new contraceptive for men: a radio-controlled implant that could block the flow of sperm with the click of a button. The device, which is still in the conceptual stages, is the latest in a growing number of experimental male birth-control methods-including sperm plugs, sperm dissolvers and heat-inducing gels-that don't tinker with testosterone.rnAlthough 55 percent of men are willing to carry the burden of contraception, no method exists between the two extremes: condoms (which fail an estimated 15 percent of the time) and vasectomy (an invasive procedure that's difficult to reverse).
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