These teens from the Xhosa tribe wear traditional garb and paint after their coming-of-age circumcision ceremony near Qunu, South Africa. CARL DE SOUZA/AFP/Getty Images hide caption

itoggle caption CARL DE SOUZA/AFP/Getty Images
Lee Woodgate/Ikon Images/Corbis

Where a boy is born has a big influence on whether he'll be circumcised, data from the Centers for Disease Control and Prevention show. CDC hide caption

itoggle caption CDC

Dr. Charles Ryan checks on a patient. Annie Feidt hide caption

itoggle caption Annie Feidt

A rabbi holds up a pillow used during ritual circumcision at a synagogue in Berlin. Markus Schreiber/AP hide caption

itoggle caption Markus Schreiber/AP

Social worker Shannon Coyne and her husband decided against circumcision for their son, now 11 months old. The nation's most influential pediatricians group says the health benefits of circumcision in newborn boys outweigh any risks and that insurance companies should pay for it. Matt Rourke/AP hide caption

itoggle caption Matt Rourke/AP