This is the big reason, it’s that TV shows can be made for adults, but big movies have to be made for all audiences to make big money.
There used to be mid-budget movies made for adults. They’d have a smaller budget than the huge blockbusters, but they didn’t need to make as much money either, so they could be riskier and edgier in their material. But Hollywood figured it’s a better investment to just make the huge budget movies, so you don’t see those adult marketed movies as much anymore. Here’s a good (and depressing) article about it:
There aren’t adult oriented movies being made by Hollywood, because Hollywood would rather make big budget movies now. This could change, like if there are a bunch of high profile flops, and tastes change regarding superhero movies, and something changes so people overseas stop going to Hollywood movies. But for right now, this is why there aren’t movies made just for adults.
Parents were freaking out about Miley. Maybe not as much, but there were still complaints. Also it might make a difference since Janet Jackson was at the Super Bowl, which had 143 million worldwide viewers, while the 2013 Video Music Awards where Miley Cyrus twerked on Robin Thicke had 10.1 million viewers.
I think some of it is that movie actors are more aware that the internet is forever. A brief flash of nudity in the 1980’s was over in moments in the theater, and most likely excised out of TV reruns, but now is around forever. Movie actors, both male and female, were probably more willing to work nude in the days when it was once and done, as opposed to now when it’s available to children and grandchildren not yet born. Do you think that Julie Andrews would have gone topless in SOB if she knew that stills of that will be in her obituary?
That’s the thing- back in the day, you had a 3 rating system - G for children’s movies, R for grownup movies, and PG for everything in the middle.
So if your movie wasn’t a G, and wasn’t quite profane, violent or naked enough for an R, it got PG, even if that meant a small amount of shits or bare boobs made it through.
Once PG-13 came around, most of the movies with any profanity, nudity or violence at all rolled into that category, and you had a sort of identity crisis in the G/PG ranks.
So PG effectively became what had been G, and G got reduced to absolutely innocuous small children fare. Even the freaking Muppets movie with Jason Segel and Amy Adams was PG rated! So was “Frozen”!
I’d bet that PG-13 has encompassed a lot of what used to be PG, and a fair amount of what used to be the more timid R movies. I bet a LOT of older PG movies would be PG-13 if made today- stuff like Sixteen Candles, Spies Like Us, Fletch, etc…