Research is underway on a new device that would allow men to control their fertility by literally flicking a switch. Given that a recent study confirmed that a whopping forty percent of pregnancies worldwide are unplanned, this kind of male contraception could have a dramatic impact. Besides affecting parental and child wellbeing, it would have long-reaching effects on the health of our environment. What might the world have looked like today if something as simple as a “switch” had been available decades ago?