This report aired May 10, Wednesday, 9 p.m. An encore presentation airs May 31, 9 p.m.: It's the latest in Dateline's month-long series of undercover investigations— children at risk from grown men online. This time, we take our hidden cameras to Florida. We thought we'd seen and heard just about everything, but what we found there surprised even our own Chris Hansen. A warning: some of what you're about to see is explicit.