Weird news - a real stopcock

This is sort of weird medical news, but it also sort of makes sense. Some one has invented a device, a real stopcock of sorts, actually a flow switch, and when the device is surgically inserted into the vas deferens it can be opened permitting the normal release of sperm or turned off preventing the release of sperm, thus allowing the implanted, or who ever has their hand on the switch, a choice in terms of the ability to impregnate or not. This also gives new meaning to the concept of getting "turned on". All to keep interested readers informed.