My wife wants to swing?

[Michael]

I have been married to my wife for little over a year and recently she asked if I would be interested in swinging. I already knew about her past experiences with girls and her desire to have a threesome with another girl but now she would like to add a male. I was shocked and never knew this is a desire of hers. I have NO desire do swing with another couple and feel I have been mislead. It makes me feel a little inadequate and that she does not value marriage the same way as I do. When I said 'i do' I meant it and never wanted to have sex with another women for the rest of my life. Now every time I look at my wife I can't get the thought out of my head that she wants to have sex with another man. It grosses me out. What is even more disturbing is we have a child and I do not want to bring this kind of lifestyle into my family out of the risk that this could destroy our family. How should I handle this?