I have three:
1. My wife was my first. I was 17 and she was a hot 25-year old and we fucked like rabbits. I was obviously not her first, second, third, fourth, fifth, etc. I recall fucking her nine times one day. Just couldn't get enough of her. When we got engaged years later, she asked me if I wanted to fuck someone else so that I'd be sure and not want to fuck someone else when we were married. I thought it was a test, so I said no she was all the woman I need. I should have said, "Well........that's a smart idea."
2. I was newly married and in love with my wife. Back then, I thought I outkicked my coverage getting her. I was working with a beautiful girl just out of college who was a former college cheerleader and was a Miss Pennsylvania contestant. She looked like a Dallas Cowboys cheerleader. We went to lunch together and one day while waiting to go through the drive through, her face was really close to mine. I paused and backed up. Dumb. This same woman invited me to her place on Christmas Eve which wouldn't have been easy to explain why I wasn't home for Christmas Eve, but had I known my marriage would have ended in a divorce......
3. After being married a few years, it seemed like I was always the one initiating sex. Not that she ever said no, but I thought it would be nice if she would initiate it once in a while. So I wanted to see how long she could go without it. It was going on two weeks and she finally said to me, "If you're not going to fuck me, I'll go out and find someone that will." I was so turned on hearing her talk like that I had to fuck her twice right then. I should have held off and had her go out and become the hot slut wife I later wanted so bad.