WHEN Larry Massa says he likes to travel light, he means it. No need for a jacket and tie at dinner, a pristine set of tennis whites when he hits the court, or even a bathrobe to wear when heading from his hotel room to the pool or the spa.

No matter how popular and upscale nude resorts become, one social convention is unlikely to change: Nudity and family vacations don’t always mix.

Just ask the Massas. They simply can’t convince their children, all in their late 40s, to join them on their two or three trips a year.

“Mom,” replied her son, “I don’t want to see you naked.”