So go back in time with me to when the humans first evolved. Now as a male your god given responsibility was to make more humans because the life span was 25-30 years max and you want to spread your seed as much as possible so your instinct was to "get with" (͡° ͜ʖ ͡°) as many girls aa possible so there would be more humans on the planet. It remained instinct for thousands of years because the male brain loves novelty and naked chicks it loves new naked chicks.
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Edited by Commander Tempu: 6/3/2017 7:51:21 AMI think you forget economic status job status work status and home status. Each male has different values and some might cheat while others will not. Some want to have something solid to come home to but at the same time don't feel there partner meets there sexual needs. Relationship problems usually trigger this in so many ways. Watch that show cheaters and see how it really is then come back tell me it was evolution at play. You could be rich as hell and have a mistress. You could be married and your wife does not know you have a secret love affair. You can be a pimp and not have to worry as it is a business.