It is a brave new world
Had a similar conversation with my wife. She is open to the experience of being intimate with another woman and I. But she comes from a very conservative background and thinks the guilt after the fact would be an issue. Having a relationship that opens the door for all three of us to be together is more appealing to her. I like the idea of the relationship and friendship being the doorway to something else, naturally. That is why I am on this forum. Learning and listening. It is a sensitive issue not to be entered carelessly for sure.
I am here if you ever want to talk,