Pope Francis

For some reason, though, the UN doesn't designate an "International Day of Zero Tolerance for Male Genital Mutilation," nor to my knowledge has the Holy Father ever publicly applied his church's catechism to the practice of involuntary male circumcision.

According to that catechism, "except when performed for strictly therapeutic medical reasons, directly intended amputations, mutilations, and sterilizations performed on innocent persons are against the moral law."

Why is it considered unacceptable to genitally mutilate infant girls, but acceptable — or at least not important enough to vocally oppose — to genitally mutilate infant boys?

There are certainly religious explanations. The Pope's religion is an offshoot of Judaism, which practices male but not female circumcision, while female circumcision is confined to some sects of Islam and to some animist sects.

But the bigger reason seems to be simple popularity.

More than a third of male infants worldwide are circumcised. In western cultures, pseudo-scientific "medical" claims, ranging from a variant of "balancing the humors" to the notion that it reduced the desire to masturbate (a practice also pseudo-scientifically tied to various ailments), popularized the practice in the late 19th century.

Moving into the 20th century, male infant circumcision became nearly universal in the US. As each pseudo-scientific claim supporting it fell, another rose to replace it, but we invariably eventually find that infant male circumcision is almost never therapeutic, let alone universally so.

Some parents still allow their sons to be circumcised for aesthetic reasons (so junior's penis looks like senior's, for example), or because fake health claims continue to circulate, but the big reason seems to be "well, that's just what people do."

Fortunately, the popularity of male circumcision seems to be decreasing. That's a good thing. But it's disturbing that we continue to entertain it as acceptable at all.