Why is infidelity considered wrong?

Infidelity has increased significantly among married couples in their 20s, with the Wall Street Journal reporting that, "Between 1991 and 2006, the numbers of unfaithful wives .... In this framework, you can both express your desires, while taking your partner's thoughts and feelings into serious consideration. read more

Adultery is considered wrong because in many situations the two people in a marriage trust each other not to have sexual relations with others. Adultery is not a universal wrong, however. Some peoples' marriages are arranged so that sex with others is allowed, sometimes under certain conditions. read more

Is it cheating when after an argument she says " Well if you don't like it go get it somewhere else" as though mocking your fidelity and vows is good for the marriage. Maybe some of the ladies can answer that one. read more

If you mean cheating in the sense of breaking the rules of a game in order to win, it is a matter of taking away someone else's reasonable expectations of a fair game. read more