My wife and I have had a 3-some and we both felt slightly jealous afterwards and decided not to do it again. Weeks later however we came to the conclusion that we both loved the sexual experience and came to a rather unorthodox conclusion.
We have both been involved in a 3-some since but never together, we then tell each other the stories and we have no jealousy.

So to sum it up, please be ready, and watch for the jealousy.

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Love...the slowest form of suicide.