Poly-ish Review Of The Unbearable Lightness Of Being Poly-ish Movie Reviews

How well does this particular fan recommendation hold up to Joreth's poly critique?
Sometimes I think that maybe I'm actually speaking a different language from everyone else, and maybe I have some kind of universal translator or babelfish so that I can't tell, but that the translator is buggy or slightly off in some ways. Because people don't seem to use words in the same way that I do. Even with a dictionary, people use words differently, and I find that I am constantly having semantics arguments because we can't discuss a topic until we are all on the same page about what the words we are using mean.
One of those words is polyamory. I'm a pretty big proponent of using the definition of a word that the person who made up the word uses. In some cases, I think the Argument from Authority is a good one. If you invented or coined a term, then you get to decide what it means. This is even more important, to me, the younger the word is. And if the word was invented or coined within the same generation (i.e. roughly 30-ish years) and the coiners are still alive, then there shouldn't be any debate about "living languages" and so forth.
So, to me, polyamory is about having or wanting multiple simultaneous romantic relationships in which all parties consent to the arrangement. That means that they all know about it and agree to it willingly, not grudgingly. If you don't say yes, it's not consent. If you are coerced, it's not consent. If someone uses their position of authority over you, it's not consent. If you are not aware of any other options, it's not consent. If you are not allowed the opportunity to back out, it's not consent. And so on. Polyamory is also, to me, more about building intentional families (even if some of those relatives are "extended" relatives) than in experiencing sexual encounters (also explicit in the definition - a word's definition is not necessarily limited solely to it's literal translation, the intent and cultural context of a word is also taken into account).
So when someone suggests a movie to me that they claim has polyamory in it, I am now highly dubious about that claim. I have been recommended all manner of cheating and swinging and other non-monogamous movies, but very rarely do I find actual polyamory in these films. Every so often, a cheating movie might make it into my Poly-ish Movie List because I believe from the context of the story that it would be polyamorous if not for the circumstances, like the era or culture, that prevents the characters from openly declaring their relationships that are, nonetheless, loving (like Same Time, Next Year) - I basically feel that the characters are poly but possibly trapped somewhen/somewhere that they can't express it properly. Many times, it's hard for me to really quantify why a particular borderline movie is poly and why this other one isn't. It usually boils down to tone, and a vague sense of "moralizing" that I may or may not get from the storytellers.
This was the problem I had with The Unbearable Lightness of Being. I kept getting told that it was a poly movie, but there was just something wrong with its tone. Tomas is a philanderer who seems to be afraid of commitment and keeps his emotional entanglements to a minimum. Basically, he has sex with lots of women a few times and drops them when they start becoming "serious". Except for one woman, Sabina, who basically seems to have the same outlook as Tomas, in that she hightails it outta there as soon as a guy starts getting "serious" about her. They appear to have a mutual respect in addition to their mutual attraction and mutual passion because of their shared interest in not letting anyone get close to them. Ironically, that barrier that they both erect to keep people out is what ties them together.
Along comes Tereza, an innocent young girl who manages to, as far as I could tell, guilt her way into Tomas' life. She shows up on his doorstep with no place to stay, and so breaks his rule ab