Many women have made a dramatic change in their use of contraceptives of late. Specifically, use of “contraceptive apps” such as Natural Cycles, a smartphone app that predicts the days on which a woman is fertile and can be used for contraception (as well as planning pregnancy), is on the rise. By closely tracking a woman’s cycle and temperature, such apps designate unprotected sex safe or unsafe each day. When unsafe, the use of barrier methods of protection is advised. Natural Cycles was developed by CERN scientist Elina Berglund and her husband, Raoul Scherwitzl, whose scientific background has lent the…

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