We're a long way from participating in this lifestyle. Just a couple of small talks here and there. She did joke that maybe we can be swingers after the kids move out

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Being able to share your significant other with another person takes a level of trust and love. I agree with hilltop that we need to make sure our marriage is solid before jumping in. Swinging without a solid relationship foundation is like asking for trouble.
Ditto to two4youinswva's post. Mrs. Icoupa has so many qualities that I won't find with another person. Even if the other lady is a perfect 10 and is a sex goddess, I'll still be leaving with Mrs. Icoupa.
Intuition's comment makes a lot of sense " by avoiding the very things you fear, it causes them to grow in size and power. " Just being able to talk openly about our fantasies already made our relationship that much better.
Thanks for all the responses.