'Twilight's' Kristen Stewart 'not allowed to grope' Dakota Fanning

"Twilight: Eclipse" star Kristen Stewart shares a tender kiss with her friend Dakota Fanning in their new film, "The Runaways." 

Kristen plays Joan Jett and Dakota plays her Runaways band mate, Cherie Currie. But Joan told the Dish Rag this week that if the love scene had been accurate, the movie would have needed a stricter rating than just an R.

Now we find out that the real reason for the chaste kiss.