I have no problem with polyamory, in fact in some ways the idea appeals to me and excites me. But somewhere along the way I have determined its not for me, at least not at this time. im2smrt4u and I are each others only partners...ever. We have never been with any one else and while we do talk openly about the idea of a threesome or something we have both kinda determined that its not really the best option for us. At this point, we are still learning about each other and we don't need to complicate things by bringing in an outside person.
As for one of us going it alone and finding someone to sleep with on our own, thats a deal breaker. As we have both entered into our relationship under the idea that we would be exclusive. The day he wants someone else or the day I want someone else with out each other, will be the day we no longer want each other. (Not sure I'm expressing this right) I want him more than anything and that cancels out any feelings or wanting I may have for anyone else. This is just how I am and I know how he is. But that is due to my upbringing, my mother cheated and it destroyed my dad for a long time.
Neither of us could stand the thought of the other one touching someone else for pleasure. Now if the situation were to ever arise, and we discussed it completely, where we found one person that we both loved and felt attracted to we might bring them into the relationship. But at the moment I feel very much like Lois in the one episode of Family Guy where she gets her black belt:
"This is mine, this is where my babies come from"
I love that segment!