A form of male contraception has been invented that allows a man to make himself temporarily infertile by simply flicking a switch.
German carpenter Clemens Bimek claims the invention, an implanted valve to stop the flow of sperm, will revolutionise contraception.
The surgery required sees a valve, less than an inch long and weighing less than a tenth of an ounce, implanted on the vas deferens, the ducts that carry sperm from the testicles.