How about the guy that was "happily" married to a conservative, average looking (real boobs lol), all american type girl that both families (and all their friends) encouraged to marry, who had everyone jealous of their life. Fast forward 20 years to when "their" son is ~18, while still happily married, he finds out that he is NOT the father of said child. Then to see her shock when he wanted a divorce! Of course he's an honorable man/father and still takes care of the child he raised because he'll always be his "daddy."

For every one of your outlandish examples, I'm sure I can find a similar counter.

Edit: Don't take that to mean I think only chicks screw around, many of my examples would be dudes in the wrong. This is just one counter to your ridiculous post