My wife and I have been together for almost 9 years. I won't go into detail, but in the past we've been through some things that would absolutely destroy most couples, but we always fought our way through and in the end came out stronger because of it. Right now we feel our relationship is about as strong as on can be. She is bisexual and I am straight, and recently we have begun to heavily discuss and consider bringing in another bisexual woman to have a closed triad/triangle/trinogamous (whatever you want to call it) relationship.
Of course, we wanted to do some research, but almost everything we can find seems to be negative, and almost everything negative listed we were able to figure out just in our general discussion beforehand. We know that it could be hard in the beginning. We know that early on there could be some jealousy arise that will go away with time once we get used to the situation and it becomes the norm for us. We know we have to be completely open and honest (which the 2 of us are already that way). We know that the love and affection would need to be spread evenly, and that there possibly may be times where it might get a little lopsided, but we'd be fine as long as it didn't get out of hand. We know there would always be the possibility of 2 vs. 1 arguments, however we also realize that when 2 get into an argument, instead of taking sides, the 3rd could be an intermediary. Pretty much all the negatives we've seen listed online, we already thought of.
It just feels like on all the websites with negative information, it feels like A) most of the information is coming from people who dove right in without giving it enough thought, and B) people like to treat relationships as something far more complex than what they really are. Is there anyone experienced in that type of situation that have some positive information or advice?