If your social media habits are like mine, then every few weeks you run across a video celebrating life without children. A recent TikTok introduced viewers to a couple of “DINKs” — double income, no kids. They boast about how they can go to workout classes on the weekend, plan European vacations, “get into snobby hobbies like skiing and golfing” and, somewhat bafflingly, “go to Florida on a whim.”