I had my mistress come over to my house while my wife was at work, and had sex with her in my bed. I gave her a kiss good bye. Then came through the door and gave my wife a hug and a kiss and said "I'm glad you're home, I missed you." And then we went to bed and had sex. I felt amazing.

Edit: This was 3 years ago. My relationship with her ended abruptly when she found out I wasn't going to leave my wife for her. She was older than me by about 5 years, so I'm pretty sure she was married herself. We were each other's side pieces. I never saw or heard from her again, and have had absolutely no desire to continue our affair. My wife and I are still together. I have no desire to cheat again, and I don't think I will. I was young and dumb and in a rut. I'm happy now.