Three years ago I told my wife that I wanted to watch her with another man and we started role-playing during sex using her dildo. She even gave her dildo a name. She loves to talk dirty to me while we are playing and tells me she knows how much it excites me to imagine her with another man. It has even gotten to the point of her having continuous orgasms while I'm using her dildo on her, but still gives me a hard no when I ask if she wants to make it a reality. I'm hoping she just hasn't met the right guy yet. I'm still hoping she will change her mind one day.I am at the same point for my wife. I know the interest is there we joke about it but at the same time the conversation is never serious enough so we can act on it and cross that line.
I'll give you take on my wife since it may help you with yours.
The fact my wife is willing to joke about it means she is interested and almost certainly is thinking about it. However I don't think either of us are at the point we are comfortable enough yet to tell each other. I am sure this is a very common phase.. As things progress I am even getting more comfortable with the thought as well.
Getting a realistic dildo and role playing and getting her to talk dirty in bed seems to make sense. If she takes to that it probaly not too far off from either finding another couple or guy.