I've had somebody approach me about Curly and I said "You'll have to talk to her about that." I had to wonder if perhaps he thought I'd put in a good word for him or something. I told her he'd asked about her--and that was it. I won't do anything more than pass along the information that somebody asked; I won't encourage or disparage the possibility to either party at that point.
I'll only offer up my thoughts if Curly comes and asks to discuss the potential relationship. So I view it as an unnecessary step in the process if somebody comes to me first to ask about her.
When speaking of various forms of non-monogamy...it ain't poly if you're just fucking around.
While polyamory, open relationships, and swinging are all distinctly different approaches to non-monogamy, they are not mutually exlusive. Folks can, and some do, engage in more than one of them at a time--and it's all good.