"People e-mail me all the time about it," Mr. Rosenbaum said. "Is it legal? Is it really platonic? There's no 100 percent way to be sure, but we have zero tolerance if a friend says they were solicited. There's no second chance."
"In Japan and China, they're more cultural because having a full family is so important," he said. "It's common to rent a fill-in family member for a wedding, like a father figure or someone to stand in as an important uncle to give a toast."