The male circumcision rate in the U.S. is falling. According to a review published in Mayo Clinic Proceedings, about 77 percent of males, aged 14 to 59 were circumcised as of 2010 compare to 83 percent in the 1960s. Even accounting for this slow decline, circumcision is far more common in America than most other places. The World Health Organization estimated in 2007 that approximately 30 percent of males globally were circumcised. But are there health risks to the uncircumcised or is this primarily a religious and personal preference? We talked to urologists Dr. David Cornell and Dr. Thomas F. Kolon to get the facts straight. Here's what you need to know.