Oh, I see that "not interested" was also the phrase that Inyourendo used. Heh okay, let's just say that in my own personal experience, I've encountered a few who were not interested in the idea, and a lot who were -- not even scared -- offended would actually be a better word. I can't tell you how many times I was assumed (with crystal clear verbal confirmation) to be a cheating sleazebag. Admittedly that was before I found OKCupid (although that's a whole other story).
Well at the very least I can see why someone wouldn't want to become an "established couple's hot bi babe." Still a reversal on the stories I usually hear though, it's usually the married man who inspires the disinterest in the person he's propositioning. Which is exactly why seeing the different angle on things caught my interest.
Love means never having to say, "Put down that meat cleaver!"