You said that you had read a book on swinging…why not give the book to your wife and tell her that you found the concepts in the book interesting and would like her opinion on it.
Ted and I are both avid readers and it is not uncommon for either of us to read a book and then ask the other to read it also, so we will have someone to discuss it with.
If you both surf the web you could show her this site and say something like…”You have got to check this out it’s so interesting”.
In both cases I wouldn’t come right out at first and say that you are interested in trying this, just that you found it interesting and wanted to know what she thought about it. It will open the lines of communication between the two of you on the subject and that is the first step. It might take months or years before anything would come of it, but you have to start somewhere.
As others have said, watching porn and sharing sexual fantasies with each other is always a good idea.
No matter what you decide always remember that trust, honesty and patience, as well as, COMMUNICATION are the most important things in any relationship.
Teresa