I imagine that's the way it's been for the overwhelming majority of married men since the dawn of humanity. The DNA of a man is that of a sexual predator. There is no "off" switch when they tie the knot. Likewise, women are submissives that will give in to the right dominant. Since it takes two to tango, there are just as many female cheaters (perhaps more) than males.
It is true that many men love the freedom to act as sexual predators with a clear conscience, that comes from their belief that doing so is in his DNA.
But it ain't so. The DNA of chimpanzees, lions, elephant seals, and many other animals, is that of a sexual predator -- but not men.
The DNA of every living creature has been passed down to the creature from its parents, grandparents, and on back through the generations. The one thing all those ancestors had in common is that they all raised offspring to maturity - humans, hyenas, every species.
But throughout the countless human generations, becoming a grandfather must have been something of an unusual achievement, what with disease, predators, etc. And yet every single man jack of your forefathers fathered at least one kid, being a kid who reached maturity and had kids of his own. Not one single exception to that iron rule.
Now, humans are very unusual in that human offspring are helpless and vulnerable for ten years or more. No other animal comes anywhere near that period of dependency. What is the trick to protecting and nurturing vulnerable offspring for ten years or more -- why, sharing the load of course.
It can't be ruled out that, over the generations, one of your ancestors might have been raised to maturity by a single parent - but you'd better believe that having two parents around for most of your childhood was a key factor whether or not you reached maturity, and by far the huge majority of kids who made it were raised by parents who stayed together and raised the kids together.
Even the most virulent men of the my-genes-make-me-a-sexual-predator persuasion, is forced to acknowledge that in fact we get our DNA from ancestors who stayed together to raise their families. Those ancestors had genes that gave them the abilities to raise a family, and genes that made them want to do it -- and because they succeeded, they have passed their genes for succeeding onto us.
Genes for being a sexual predator work for gorillas, lions, hyenas, and many other species. But not for humans.
Do you want real proof that you have genes that equip you to fall in love with a woman and raise a family with her?
Think of this: all the species in which the males have genes for being sexual predators do not discriminate between females. But human males have a distinct DNA-generated preference for females with smooth clear complexion, high hips-to-waist ratio, firm round breasts, strong arms and legs, and all the other things that signal health and vigour to the subconscious male mind.
But human men are
repulsed by wrinkled saggy females. The revulsion comes from our genes, just as much as does the attraction to young healthy women. Our genes tell us not to bother with the wrinkled woman, as she is not a good bet for the long term relationship needed for raising a family -- which is all our genes care about.
The fact that you have the genes that make you attracted to healthy fit young women, and repulsed by saggy tired old women, is proof that your genes want you to choose someone to stick with long enough to raise your kids, together, to maturity, to have kids of their own.
True sexual predators of the animal kingdom don't have genes that give them the will-she-make-a-good-mother preference. Only humans have genes that do that.
If your DNA really wants you to be a sexual predator (like a chimpanzee), you wouldn't be repulsed by saggy wrinkled women. The fact that you prefer young healthy women proves that what your genes are really telling you is to fall in love and raise a family.