According to National Geographic, the planet Mars is visible without a telescope on many clear nights. The planets Jupiter, Mercury, Venus and Saturn are also viewable without the aid of magnification.
Emotional cheaters usually feel zero guilt for their extramarital relationship. But that is the very definition of emotional infidelity, and the word infidelity is used to describe this type of relationship for a reason... It breaches the bonds of marriage. Even if the body remains monogamous, the heart does not.
Ultimately, to function happily as a couple, your agreed upon definition of cheating must include both emotional and sexual components. Finally, years of working with couples have shown me that couples often wait until they're in a trouble spot to discuss uncomfortable issues, and the issue of emotional infidelity marks no exception.