Pound Pup Legacy

As once who was force-fed secrets and lies about parenting partners,  I found the following observation made in a BDSM/Fetish website very insightful regarding the realm of acceptable behavior in Intimate Relationships:

It's my opinion that secrets are a serious pitfall with regard to polygamous relationships.

Or, to be precise, in the poly relationships which has 3 or more persons relatively tightly knitted together, as opposed to a stable couple being open to temporary play-partners.

The trouble is as follows:
Every secret is something that A tells to B, under the admonishment that B must not tell C.
Now, C would in most cases be affected by the information.
And A would be affected, if C were told.

So in reality, A telling a secret to B is to ask B to choose between A and C.

In relations where A is intimate and C isn't, this is mostly not a problem as the loyalty choice is clear.

But in poly relationships, where both A and C are intimate with B, the choice is not clear, and A telling B a secret will undermine the trust between A, B and C sooner or later.
Because even white secrets, the innocent ones, where noone is really harmed, will come for a day sooner or later, and if C discovers one, C will suspect there is more. And maybe those won't be as innocent.

Thus, it's my opinion that any kind of secret will undermine a close polygamous relationship.
And I think this should be dealt with by B telling A in advance that any supposed secret would be told to C immediately.

I'm aware that cases are not always clear and cut, but this is still the best way of handling secrets, as I see it.  http://mydungeonspace.com/forum/viewtopic.php?p=66598#66598

If a person learns early in life, it's safest to keep secret feelings from a loved-one, what sort of future relationships will that person have?