That temperature lag is the same that makes July the warmest month instead of June. I'm not sure how universal it is, but August generally got warmer nights than June.
A. It depends on the media. Music have been having a huge development for example, so it will take a lot of time for it to go cyclic. But there's cyclic trends built in, even without the nostalgia. Main thing is limited culture "modes" so to speak. One easy example is sun tan. You can only get 2 maybe 3-4 largely different degrees of it, so the options are limited. The second is inspiration from the old trends.
If it's possible, every new cycle does have something new though. While culture is cyclic, it's also progressive.
B. Good question. While reaching the levels of the 50s is probably out (the US has pretty much gone to hell and is in total denial on it with total nostalgia for it to happen), it's not unlikely to become less. Swedish media is more prudish now than how it was say 20 years ago.
I don't think it's going to becoming much more graphic though. The shock factor is mostly gone, the extreme easily accessed anyway.
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