Is it unreasonable for people to desire others outside of their marriage and still be completely loyal? Is this more common in men, women, or neither?

Is it unreasonable for people to desire others outside of their marriage and still be completely loyal? Is this more common in men, women, or neither?
Is it unreasonable for people to desire others outside of their marriage and still be completely loyal? Is this more common in men, women, or neither?
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