German inventor Clemens Bimek recently introduced Bimek SLV, a small contraceptive device that stops the flow of sperm through the vas deferens with the literal flip of a mechanical switch, rendering its user temporarily sterile.
Toggled through the skin of the scrotum, the device stays closed for three months to prevent accidental switching in the event that things get especially hot and heavy.
Bimek himself has been testing prototype versions of the device since June 2009, when he had two valves implanted. Over the past six years, he has continuously improved and refined his product.
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Source Credits: Danny Clemens in Discovery News