A short one: Ma'am, please don't get huffy with me when I tell you that you'll have to stay with your kids during an R rated movie. It's the law, and I'm not going to become a felon just because you don't want to see Devil's Due.
I was working at a cinema when Bridesmaids came out in the UK, and the amount of parents who tried to help their kids sneak into it was incredible. Apparently, because it was a "chick flick", they'd decided that it would be fine for their little froo froos, in spite of it being a 15.
I took to looking parents in the eyes and declaring "It starts with an explicit sex scene and doesn't get better from there." Most of them would grab their little "angels" and run out, scandalised.
(Interestingly, the other largest group going to see the film while I was working was Seniors! I'd always check they knew it was pretty rude and crude, and they were perfectly happy with that!)
This is another misconception I've noticed in popular culture - that today's seniors, and children, are the same as seniors and children from several generations back.
Today's seniors are have had fifty years of "modern" ideas about sex, and bad language, and rock-and-roll. They don't rant about long hair, they tell stories about being hassled for their own long hair. They're not delicate sensibilities from 1910.
Similarly, children today probably know there's something called "sex", and likely a lot about it, by the time they hit Grade 3. If they don't, their parents must have banned TV on them.