Obviously, R-rated movies tend to be more intense than PG-13 ones. R-rated movies are generally more full-on, but some PG-13 movies are similarly intense, even if they're not quite as in-your-face with their violence, sexual content, or otherwise adult-oriented stuff. And also widely known: The Dark Knight is one of the more violent/intense PG-13 movies ever made. That part’s pretty gnarly for a PG-13 movie, but otherwise, Gravity works in a level of suspense that feels R-rated without actually having too much graphic violence or persistent profanity. It pushes things as far as PG-13 movies go for sure, too, since it’s got quite a bit more by way of intense violence and sexually charged scenes that you're likely to see in the vast majority of PG-13 movies.