In the never-ending quest to sell more product, corporate advertising Solons scrutinize mountains of demographic data to slice and dice market segments into assorted variables – measurable characteristics like age, income, gender, location and other factors that help to pinpoint likely future customers. There's nothing particularly wrong with this, and in fact, it usually makes a lot of sense. That's why tires, transmission and Super Bowl tickets are advertised in the sports sections of newspapers – preponderantly read by men. White sales, ads for drapes and rug clearances are generally in the women's pages. Starting in the late 1960s, when...