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Foreskin is in — and circumcision has been in decline for some 30 years, a new study from an arm of the Centers for Disease Control and Prevention finds.

Americans today aren't as anti-foreskin as they were when Ronald Reagan was president: 58.3 percent of American baby boys in 2010 were circumcised compared to 64.5 percent in 1979. So while that's a high number compared to, say, Canada, where only 30 percent of boys are circumcised, there is increasing evidence that American parents are generally comfortable not tinkering with their sons' manhoods (even if, since 2007, there's been a slight upward trend in American parents making sure their baby boys are cut).

The numbers come from a 30-year study published this month by the National Center for Health Statistics, a branch of the CDC. The numbers indicate that the circumcision rate in the U.S. is close to the lowest it's ever been (the nadir for circumcision was in 2007).

So what do uncircumcised penises say about Americans? Is the stigma attached to foreskin finally at a breaking point? Are we at an aesthetic junction? Have all-things-nature hippies won?

The answer is complicated.

The NCHS discovered that Americans actually listen to their doctors (for the most part). The peaks and valleys throughout the years correspond to studies, recommendations, and walk-backs by medical task forces. The researchers write:

For example, American Academy of Pediatrics' (AAP) task force reports during the 1970s stated there was no medical indication for routine circumcision of the newborn; AAP revised its position in 1989, stating there were potential medical benefits to newborn circumcision; and then in 1999, an AAP policy statement said that, despite potential medical benefits of newborn male circumcision, there was insufficient evidence to recommend routine circumcision of newborns.

But that doesn't explain the all-time low in 2007, which came during a time when the World Health Organization was stating that circumcision could lower the risk of AIDS. Currently, the American Academy of Pediatrics says that circumcision benefits outweigh the procedure's risks — but does not endorse routine circumcisions.