Long-time BreakPoint listeners know about Japan’s catastrophically-low birthrates: by 2060, Japan’s population is projected to fall by a third, the same percentage killed by the Black Death in 14th-century Europe. Japan’s demographic decline has spawned some creepy adaptations, such as lifelike talking dolls for elderly Japanese without grandchildren, or the borrowing of other people’s grandchildren for a day. Attempts to encourage child-bearing through economic incentives have failed, as they have in other countries with low birth-rates. Younger Japanese aren’t interested in reproducing themselves. And now, according to a recent article in the UK’s Guardian, they’re increasingly uninterested in sex, as...