Photo by Jamie Grill/ Getty Images

Are parents getting desensitized to sex and violence in movies? A new study reveals that "PG-13" movies now contain more violence than they did in the 90s, and the number of sex scenes in "R" rated movies is up too. But why? It may be because the more parents watch movies full of sex and violence, the less they care about the age of children watching them, too.

One thousand parents of pre-teens and teens were shown several movie clips in succession. At first, parents rated violent scenes appropriate for kids at the age of 16.9, and the sex scenes appropriate for those age 17.2. However, by the end of the study those ages dropped--parents thought kids age 13.9 could watch the violent scenes, and it was appropriate for kids age 14 to watch the sex scenes. 

You can read more by clicking here for a story is US News.