It was her to bring it up first. We had only been dating about a month when she turned to me after sex and asked if I would be interested in including others. At that time I looked at her and asked if she meant "swinging" and she said sort of. That's when I brought it up that my ex and I swung for about five years and she said "really?". I said I needed to have some time to consider this as part of the relationship and after a few days said let's try it. That was about seven months ago now and we are having the best time together enjoying our "kayaking" time. Kayaking is the code word we use when talking about swinging in front of our vanilla friends. Oh, and we don't own kayaks together yet.