It seems like over half the images tagged with "cheating" are using it to mean cheating on a partner, when the tag's page defines it as "Act of completing something in a way that is not fair." The tag they're looking for is probably "infidelity" or "adultery."
Perhaps new tags to the effect of "unfair_play" and "academic_dishonesty" could be created, with "cheating" having a disambiguation page? (I've never uploading anything myself, only edited tags, so I'm not sure how best to prevent a misunderstanding there.)
Updated by Dyrone