Why do men cheat? Well, statistically speaking, the only genealogical thing that separates the standard model of a man from a woman, is that when we are created, our brain is doused with an uncountable amount of testosterone. The only reason why it is uncountable is because the amount will between different male subjects. To the main point, the cause is that, the effect is that males will averagely be more bold, more daring, more courageous, than females, and will tend to think more selfishly of themselves whether they know it or not. Now, it could mean that they think more highly of themselves, or that they deserve better or that they deserve more. Why I think males my cheat is because they aren't getting enough of what they want, or what they need, and they will look elsewhere to find it, as long as their needs and wants are met, or they think that their needs or wants are met. Again, this will always vary from person to person.