Atlantic Magazine Touts “The Return of The Rhythm Method”

December 20, 2014 • Daily Email Recap

The Return of The Rhythm Method

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Every morning when she wakes up, Becca, a college student in Pennsylvania, puts a teardrop-shaped thermometer called the Daysy under her tongue. If it lights up green, she knows that day she and her boyfriend can have sex without a condom. If it’s red or yellow, they need to use protection.

With its blinking face and patented “LadyComp algorithm,” Daysy seems newfangled, but its core technology is one septuagenarians would recognize. It relies on the basal body-temperature method of family planning, based on the fact that women’s bodies are a few degrees hotter just after ovulation. But while in past decades women who employed this method had to hand-chart their temperatures on graph paper, Daysy tracks the readings automatically and ports the data onto a companion iPhone app that lets the user see her “cycle forecast” and “temperature curve.” Because it’s personalized, it claims to predict a woman’s chance of pregnancy with an accuracy of 99.3 percent-roughly the same as that of birth-control pills.

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