I am counting 17 lovers since my wife I first met 16 years ago - although I think I am probably forgetting a few.
My wife and I first met 16 years ago when she was 20 and I was 23. At the time she had only been with one other partner before me. After we met she went back and had sex with her first partner and also slept with her highschool sweetheart that she had not slept with when they were dating.
We were swingers for a few years so she slept with a number of guys (and a couple girls that I didn't include in the count).
At least 5 of the last 17 lovers that took place more recently was after we realized that our relationship is really a Cuckold / Hotwife kind of relationship. She like long-term relationships with her lovers and two of those last five she is still seeing now. She saw one last week and has a date this Friday with the other.