So murder, blood, killing is family friendly, sex however is not (and people will tell you that willy is very very family friendly)
This is because America rules the world, and many American oligarchs are members of the mad Puritan sect, where sex is accepted by the most terrible sin. Murders and even cannibalism, apparently, are not considered puritans than something terrible. Therefore, we have The Witcher 3, made by a European company, where there are already 5 sex scenes, but there is no cannibalism. And there is a skyrim made by an American company, where there is a dismemberment of bodies and cannibalism, but there is no sex. Therefore, a film with brutal murders in America has a rating of 13+ (pg-13) and, for example, in the Netherlands is 16+, but a film with exposed parts of the body in the Netherlands has a rating of 6+, and in America it receives R.
Sorry for my English, it's all Google's fault.