I'm sorry, I had to chuckle at your description of Miss M at the cons and you comparing yourself to her. If you're going to compare yourself to her, (which you shouldn't, for the reasons others have stated) that really is the worst possible time, don't you think? Hehehe.
My boyfriend asked what I was giggling about, and I said, "Guy is disappointed at how easily his hot female friend picks up at at anime/sci fi cons." His response? "You could take away half those words and her chances would still be like shooting fish in a barrel."
Seriously, though. Ari's spot on. There's nothing wrong with being open AND poly. I have a FWB. Don't talk about him much here because there's nothing to talk about. We have a friendship, and we also sleep together sometimes. It's just a light, easy relationship.
You seem like a witty, intelligent nerd. Sounds great to me; I can't be the only one who thinks so!