This is what I'm talking about

So yesterday I was exposed to something that really blew my mind. Polyamory.

Polyamory is the practice of having more than one intimate relationship at a time with the full knowledge and consent of everyone involved. Although it sounds similar to polygamy, its different in that it isn't so patriarchaly centered and could potentially involve all women. People in polyamorous relationships have a primary (their main relationship), a secondary (a second person to fulfill any needs they cannot get from their primary), and a tertiary (their third rung relationship partner). Everyone in the situation is fully aware of the relationship structure, and the triangle can include both men and women.
My friend called polyamourous relationships “the most honest type of relationship.” The logic behind this statement is this:
Although it is not a monogamous relationship, all parties are introduced to each other and know the situation, so technically there isn't any “cheating” by the usual standard of the word. There isn't secrecy. No one has to feel like they need to pretend about who they are. If you don't like sports, but your primary is a sports fanatic, you know they can get their fill of sports related antics with their secondary. No one has to feel unfulfilled in any aspect of their life, because they have multiple people to get multiple “things” to make them feel fulfilled in their relationship/s. With this rationale, although not a type of relationship structure I would get into, polyamory does seem to be an open/honest type of relationship. Everything has to be out on the table for it to actually work. Everyone has to be honest.
So what do you think? Polyamory = “the most honest type of relationship” ???