We started slow and were steering toward just MFM from the beginning. It seems that after exploring and expanding our boundaries well beyond, that is where we've come back to now - if at all. From the beginning she was not as accepting of seeing me with another woman, whereas I found it really hot to share her with men. There were a lot of lessons learned along the way and many incremental expansions of boundaries. Our ethical non-monogamy slowly evolved to include full swaps with other couples, and even a few FMF situations.
With the full swap couple experiences, a few were really well aligned all around and we definitely had VERY memorable great times with zero edge. There were a few MFMF encounters along the way where I could tell she was not keen on my participation with the other woman but she let it go. Usually because she was getting her brains fucked out!
On two other occasions I not-so-fondly recall her jealous bug surfacing, and despite the fact we had agreed in advance that what we were doing was all good she became upset with what she saw. One time biting my member while we were all tangled up in a mass of naked bodies. I yelled and jumped up in time to see the devilish look in her eye. You don't forget something like that.
As protective as she can be, there were a couple of times she pulled a 180 degree mood from somewhere and shared me with her friends. I had no idea it was coming either time. One Sunday afternoon she instructed her friend to give me a BJ on the steps of the pool. Another time her recently-divorced friend was feeling neglected and out of the blue we had a full blown FMF threesome spontaneously in the living room.
I can say I have never crossed any of our predetermined lines myself, but clearly remember a few times that she has. Nearly every adventure we've had included a discussion ahead of time about concerns and limits, aside from the rare truly spontaneous occurrence we never went in blind. I wrote about one of our first weekends in a kinky environment where we both agreed no contact with others. It only took a few hours, a couple cocktails, and a paddle for her to cross that line with the birthday boy of the party. I let it go because the memory was beautiful. She has taken a few other liberties out-of-bounds, but they were always situationally unique and clearly never planned deception. Color me "tolerant" I suppose as it just keeps things in a better place.
Although it does not bother me, she does not like kissing other guys. She does enjoy kissing women when it happens. Men may not touch her face with their hands, but bukakke is perfectly fine. Many of her limits are aligned with preference not emotion.
To this day we do still have a couple of boundaries and rules to which we both hold strong. These include not playing alone, open truthful communication (no secrets), and her ass is mine. I won't share the anal cherry I took from her with others. Perhaps if we ever make it to that elusive "DP" on the list I may have to reconsider that one. Maybe.