Spouses - Confessions

Both me and my wife are involved in swinging. I do not know what this is doing to the future of our marriage? I do not know why I do not feel any shame for this type of sin? How can we stop this type of behavior? Does the bible have specific information to help us? I feel that I want to stop but cannot. We have met allot of people in this lifestyle and consider most of them friends. Please help