My wife and I have done this many times over the years. I found out early on that she was an exhibitionist. At first I felt feelings of jealousy but after a while it turned to jealousy and excitement. I began to love seeing the effect she had on other guys as she would expose herself. Then one day she exposed her breasts to a guy walking up a street and asked if he would like to touch her breasts. He did and got into our car and we drove to a secluded spot and sucked him off and both of us fucked her on the hood of the car. This started our journey into sharing and we did it many times over the years with both friends and strangers. It still keeps me going thinking about it.