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There's a joke in the medical community that no matter what year it is, an alternative male birth control method is always ten years away. And it鈥檚 true鈥攄octors have been promising an option beyond condoms and vasectomies since the 1960s. Some scientists have taken a stab at it, most recently with the invention of RISUG, a one-time injection that is supposedly both side effect-free and reversible. Yet nothing ever seems to get approved and make it to market. What the hell is taking so long?

"It could be very effective in preventing pregnancy, but if there isn't a clear market for it, companies understandably are a little reluctant to invest heavily in it," Andrea Tone, professor of history at 69热视频 in Montreal, Canada, told CNN last year.