I always love the idea that kids watching people get blown up is fine, but a seeing a pair of breasts through the same medium will make them loose/crackheads/immoral.
I am, of course, not referring to any parents in particular, it's just a mentality that I've noticed with some parents nowadays that baffles me entirely. It's a mentality apparently shared by the bodies that provide the age "ratings" and "recommendations" for TV shows and movies.