Im always very against this full disclosure with partners but periphery discussions ideal. I find if a woman has natural tendencies to do this or more Domme they will push anyways and you dont have to tell them and its way hotter when they want it and you didnt push them at all. My current wife did this and she knew I had an Ex that cheated on me a lot and I wanted to stay with her and make it work but got left and I think she realized she would have more freedoms with me if she were to ever want it and of course 7 years into our marriage it did and she was the one asking for it and she was the one reasoning why I should allow her to have men on the side and of course I didnt argue about it.