<human>: Can you summarize the given text in a few sentences?

So I, [24/F] and my partner [27/m] have been dating for almost a year. I  (like everyone else) have been burned by bad relationships in the past, but have always been very open when meeting potential new love interests, since everyone is different. This is also the story with my current partner. We've also both been on either side of the coin of infidelity (both have been cheated on and have cheated on).

That being said, both of us have what you might call a "progressive" view on monogamy and terminology when it comes to dating. We have talked about an open relationship, but are both in such a position where we care deeply about each other, so neither of us is actively searching for new partners. It's kind of more of an "if it happens, we'd rather know about it beforehand than find out about it afterwards" philosophy.

The fact is, both of us have been approached/tempted, but both of us have turned down these opportunities. The fact is, we are both incredibly fulfilled by each other, and have simply not been interested in pursuing anything on the side despite being semi-"open". We have an incredible sex life, jealousy is not a problem for us, and we are very effective communicators.

My partner [M], has brought up the idea of a FFM threesome. Neither of us has ever had one, and we're both curious. I'm pretty sexually open, somewhat bicurious, and have contemplated the idea (and I don't like the idea of a MMF threesome). I laid down the groundrule that she couldn't be a friend of ours and we should avoid developing a relationship with her post-threesome. I also would have full veto of the girl. Basically, it would be on my terms entirely. Since he caught my interest, it's something we passively bring up in conversation every so often. His birthday is around the corner, and I want this to share this experience with him.
<bot>: Loving, fulfilling open relationship for 1 yr, want threesome for bf's bday, worried of the following: