When it comes to birth control, men have not historically had all that many non-permanent options – now that looks to change thanks to a little injection called RISUG (reversible inhibition of sperm under guidance). Two small RISUG injections have been shown to be 100% effective for preventing pregnancy for a minimum of 10 years and the treatment is side effect-free and completely reversible with a few more injections.
The thing that makes RISUG so effective is that it is not a drug, it’s a polymer – a positively-charged polymer to be precise. Sperm, you see, are negatively charged – so when they travel past the polymer as they pass through the vas deferens – they get zapped. Obviously the catch is that the polymer must be injected into the vas deferens via the scrotum – but the 15-minute procedure is probably a lot less painful than it sounds… and much less painful than childbirth.