I'm bisexual and married to a girl. I wanna date a guy along with my wife - together. How can I arrange that?

My wife doesn't know it and I wanna give her a surprise of this. I'm not sure weather she will like it or not but I wanna give a try with best possibilities.
Please suggest how to kake her like to this idea?
I'm bisexual and married to a girl. I wanna date a guy along with my wife - together. How can I arrange that?
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