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Is Adultery Ethical?
It's possible the person's spouse won't mind.
Polyamory is becoming
commonplace, hence if all parties communicate their wants and desires, having extramarital sex is moral.
Some couples find that one or both of them are not completely fulfilled romantically or sexually, and agree to and open relationship in which having such relations outside of their relationship is accepted, resulting in increased happiness and preserving the stability of the partnership.
Basing morality on a subjective opinion of one or two persons results in a definition that renders the term useless.