Cool For The Summer, written and produced by Max Martin**, is Katy Perry's I Kissed A Girl crossed with the guitar riff from Sexy! No No No. Which is pretty exciting.
Buzzfeed has gotten itself into a lather about the lyrics, which it says are about a same-sex fling. You can certainly make that interpretation - she sings about tasting the cherry of someone who shares her body type - but does it even matter in 2015?
The main thing is that this is a total banger. A 10/10 pop gem. A good song by a good singer. A record you can purchase. A piece of music. An embedded audio stream.
Demi has also posted a teaser for the video on Twitter, which very definitely reminds me of that Pheoebe Cates scene in Fast Times at Ridgemont High.
* Or, at the very least, this week.
** And Lovato. And Ali Payami. And Alexander Erik Kronlund. And Savan Kotecha. And your mum.