DominicCobb said:
It isn’t until the end when it’s revealed that the parents decided to just let it happen (and we don’t see this decision making process, only the end result).

We know no such thing. In that final “speech”, Elio asks his father if his mother knows, and he says he doesn’t know if she knows or not. What is strongly suggested at the end is that they both knew about it and hadn’t even discussed it.

I should add that I was totally fine with everything in the movie until near the end when Elio’s parents are happily putting him on the bus for that trip with Oliver. It was only then that I found myself saying “wait a minute… wha?”. And that speech… “am I talking out of turn?” really? Who’s the parent here?

I am sorry if I gave the impression that everyone who liked the film is a perv… obviously that isn’t the case, as most people love the film. Only that there were lots of creepy looking people in the cinema when I went. I’d like to presume there was no such intent, but as more and more problematic behaviors in Hollywood are being exposed, I couldn’t help but wonder.