“A study released on Monday shows that one in five films rated PG, or “parental guidance suggested” — with some material that may not be suitable for children — actually have more violent actions than the average for those listed as PG-13, or inappropriate for children under 13. It also found that one in 10 PG films had more violent acts than the average for those in the study that were rated R, or “Restricted” — meaning any viewer under 17 should be accompanied by an adult.”