by Holman W. Jenkins Jr.

About the author: Holman W. Jenkins Jr. is a member of the editorial board of the Wall Street Journal.

Pornography is not a subject one would expect to come up at a baby shower. But there I was when two Manhattan women of my acquaintance began discussing the web surfing habits of their husbands. It seems they had discovered the “history” folder on their spouses’ web browsers. That’s the folder that (unless you turn it off) maintains a list of web sites visited over the previous month or so. When they clicked, it popped open and revealed a list of porn sites running off the bottom of the screen.

What struck them most was the sheer astonishing breadth and variety of the porn trove. Tastes...