Earlier quoted context omitted.
Every time one watches a romantic scene in some film you know it's fake. Actors present a totally fake version of life. Every story has to be dramatised to get over the fact that it's largely boring to people who haven't lived it. We watch so many films that they probably give us an odd impression of what reality is, what's possible, what' likely. I know what it is to sit by my mother's bed with my brain burning itse…
Not only romantic scenes, but any emotion. We are watching actors, any emotion on display is some measure of fake depending on how good the actor is. That said, we all grew up watching movies, and one could argue their way of expressing emotions are imprinted onto us, so we all ‘emote’ as actors, and their emotional acting matches our true emotions. You could expand this argument to our sexual realms, and it explains…
They might not feel anything about their acting partner, but they feel about other persons and bring that emotion into the play, to make it more real.
Similar to how the best lies are those that contain as much as truth as possible.
I know that I cannot watch anything with mechanical acting that is obviously fake (probably the majority of productions).
Speaking of it, Asteroid City is a very good movie that explores this theme.