@Simone_De_Beauvoir It leads to a lot of deception and sadness. I think at least 80% (totally made up by me) of the time when a spouse cheats (so this does not include spouses who have agreed to have an open relationship) it affects the primary relationship negatively. I once read that men, well it was about men who cheat, but it is probably true for both sexes, that men who are cheating, now have a secret with the mistress that the wife is not party too, and that bonds the people in the affair and moves the man emotionally away from the wife. Who you share your secrets with, is usually the closest person in your life. I thought that was interesting. So, that begs the question, if it is not a secret, would that maintain the marriage better than the cheating behind the spouse’s back?
I think there are very degrees of cheating, open marriages, and poligamy. It is impossible to give one sweeping answer, it is complicated. A person who says he is loyal, but cheats all of the time, serial cheater, who really has not intention of beng faithful, that would be the cheater I am talking about here, not a one time surprising, unexpected event. That serial cheating is awful; but, in America, I think for the most part the man who does this has no choice if that is what he wants, because our culture does not allow for woman to sit back and accept it generally. I know many couples that have men who are serial cheaters, and probably in the man’s mind they feel they have always done the honorable thing and kept their wives safe, roof over their heads, gifts, provided for their children, rather then dumping her out on the street for the next one. Their wife is still the primary relationship and the mother of their children. In other cultures, the women sort of comes to a point where they accept “man” cheat, this is how it is, make the best of it. But, in my experience the women hate it. It affects them deeply. Financial dependency usually keeps them in the situation, low self esteem, or fear. There are some I would guess who just accept it and are really ok with it.
There is a difference between say Latin America macho, where the Catholic ideal is married in a committed monogamous relationship, but it is rather accepted the men cheat; and say Arab Muslim culture where there are multiple wives. In both, I think with each generation, the expectation is moving more towards a monogamy expectation, similar to mainstream America. Of course all of this is generalizations and simple observations I have had, it is not any sort of scientific statistic, and I am not even saying the majority of Latin Americans or Arabs behave(d) this way.
If it is all open and honest, then at least the lying and deception is gone, and each partner can decide if that is what they want for the relationship. As long as both people are able psychologically and realistically to choose their SO and develop between the two of them the relationship and committment they both want, then it seems fine. But, when cuturally there is a tremendous amount of pressure for people to accept or conform to one standard, I think that is not so good.
I prefer monogamy for me. I do feel it has helped develop an incredible bond bewteen my husband and me, that would not have happened had we each been able to go outside of our marriage.