(Wall Street Journal) — New Yorkers Laura Jackson and Gary Zaremba met on a dating website in 2005. Two years later, Mr. Zaremba, a 52-year-old real-estate developer, popped the question. Ms. Jackson accepted. Then he popped another: “Will you sign a prenuptial agreement?” He had been through a divorce, had a college-age son and several real-estate investments. She, a publicist and also 52, had never married.