"...If your not screwing your own wife, someone else likely is..."
"Likely" is a little hard to quantify. You don't seem to be leaving much, if any room in your analysis for low-desire married women. Again, it would be bad to be blind to evidence, but it's just as bad to make assumptions without evidence. I have a hard time believing that affairs are so easy to hide that they could happen often with the only clue being a lack of sex in a marriage.
