I am not saying it's the smartest thing I have ever done. I am saying that I have done it, I am honest about it, and I was not the one to initiate it. Most times, it was just a few laughs/short term thing and over. Only once did it turn into something more, and that's because her and I had dated, seriously, before she met and married her husband. We had some left over emotions that had never been resolved.
But, I will say this to you guys who think your wife will never cheat - yes they will. And based on my experience, it's not always about money, or great looks or best body. I am not unattractive, although I am not 25 any more. I do OK financially, and I don't have a great physique anymore. But, what is the common thread is that I 1. listened to the woman 2. paid attention to details about her 3. had a good sense of humor 4. kept challenging her on things, meaning she had someone she could relate to intellectually.
Those four things are what drew the attention of these women.