Pediatricians now support making condoms available to teens, marking another important moment in the history of birth control.
1920s -- Scientists working independently in Japan and Austria devise the "Rhythm Method" of birth control after figuring out that women are fertile approximately midway through the average menstrual cycle. They conclude pregnancy can be avoided by abstaining from sex during that period.
German Federal Archive/Wikimedia Commons
Christian Hartmann, Mario Anzuoni/Reuters
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