Theory

Almost all the women I know have cheated on their husbands and the husbands never find out. The men in their lives would love to see their wives with another man as long as they are getting some also.

Well I must be the exception to the rule. Because I was never married, never had any children and was only in love with one woman who like the other two women who I have had relationships with cheated on me and left without an explanation.
I am not ugly and have been told that I am quite good looking. I am six feet three inches tall and weigh 195 pounds. I was a front man for a late 90's early 2000's ** band and I never slept with any of the women that would attend after show parties.
After the only woman I ever loved broke up with me (she was right in doing so I was a broken young man who was abused by nuns.. I never told her) I never had another physycal relationship with a woman .. and I have not had sexual relations with a woman either..
I guess what I'm trying to say (badly I know) is that there are good men and women out there ..but sadly most human beings are wretched
The only TRUTH in this world is THE KJV BIBLE

Your theory is correct, but I also think if given a chance everyone would cheat or at least try swinging. Been married twice and with the first wife I was involved with her coworkers . I never started it but they were very aggressive and at parties I would wind up in another room with somebody's wife , It never failed. My wife of course was also in some secluded part of the house with someone's husband.
This went on for several years till she found another.

I think your theory is right but also think most people shouldnt act on it. usually turns out bad eventually