>>92223555To cheat all you have to do is be stupid, impulsive and appealing to some women. Not even women, plural, just to one woman somewhere that you happen to meet when an opportunity presents.
In Japan, most cheating arises from committed men being pressured into it by their coworkers at a mandatory office social gathering, because you're basically not allowed to say no to anything at those events without it threatening your career. Married men being dragged off to brothels by their boss and forced to pay women for sex they don't want in order to "keep up appearances" is unironically so endemic there are government education campaigns about how not to bring STDs back home to your wife.
