Hi and welcome
I totally disagree with you. Polyamorous relationships do not have to be sexual. Wikipedia has a good definition ...it is the practice, desire, or acceptance of having more than one intimate relationship at a time with the knowledge and consent of everyone involved.
- Intimacy and sexuality are two different things. My partner and his SO love each other and are intimate but not sexual as yet (their relationship has been going on like this for years). It may become sexual in the future but the fact that it is not does not lessen any of the issues: they speak together about love; they are naked together; she gives him naked massages and he fondles her breasts; they kiss;he wants her to live with us.
- I don't think mfm dynamics are the most common form of polyamory. You only have to read through the threads to see that. I don't think there is a "most common" form of polyamory, it's so varied.