Several years ago, as a sub-work, moderated the forum of one theater, where the repertoire included the production of the musical "Kabaret". At that time, age marks were introduced everywhere. And if you know the plot, then you understand that it is at best 16+, or even 18+ (in the presence of prostitution, bisexuality and many other triggers for moralists). We were 18+.
Approximately once a month people came to the forum to complain about this show. In the spirit of "I decided to get acquainted with the classics of the world music and at the same time to include children, and you have on the stage THAT, fu-fu, horror and depravity!" (why mostly wrote the fathers of families, women are more inclined to get acquainted with the plot, are they embarrassed to admit in their miscalculation). When asked why, in fact, they dragged children to a play about which black on white is written that it is for adults, they either did not answer at all, or answered in the spirit of "well, this is a musical, I thought it was a family genre, there can be nothing like that!" And by the logic of things, people who write different kinds of co-co-co on the topic "Why you tell us what age it is, we will decide ourselves what to show our children!"-it is probably not they, but doubts still glow.