Birth control for men still tends to be divided between condoms (which aren't always fun or reliable) and more drastic surgical procedures like vasectomies (which are frequently permanent). Not exactly ideal, is it? However, inventor Clemens Bimek thinks he can make it just a matter of flipping a switch. His Bimek SLV project uses tiny, switchable valve implants to prevent sperm from entering the semen stream. If everything goes well, you'd have surefire contraception without dulling sensations or ruling out children altogether -- you'd just have to switch it off the moment you're ready to try for kids.