Interesting topic. Over the last number of years, some scientists have claimed that men are just biologically programmed to seek many partners, so they can "spread their seed." To that, I say, "Baloney."
I know even some species of animals are faithful to one mate. And people should have more intelligence than lower animals.
As far as why people go searching outside of a relationship, I think many factors could be involved such as immaturity, social modeling (popular in the family and accepted as okay), overactive sexual needs, and too much exposure to porn.
Because of my own values, I find it unacceptable. Men who cheat on one woman are highly likely to cheat on the next. My particular religion approves divorce for adultery. Of course, I feel the same way about women who cheat.
Of course, I'm probably coming from the most conservative view of this
issue. But if I found out that my hubby had another honey, he'd be out the door. The trust would be broken. He'd have broken the marriage vows.
At least I have started the discussion. Remember this topic was brought up as a discussion, folks, and not for folks to pounce on people's beliefs and ideas.