The term “micro-cheating” refers to acts that fall short of most definitions of infidelity but may still disturb a partner, such as flirting with an attractive neighbor or co-worker, but with no intention of straying. Sexual fantasies are another matter. While many experts believe sexual fantasies about other people, if they are not acted on and do not become a fixation, are not necessarily unhealthy for a relationship and may help maintain sexual energy and interest. But researchers emphasize that sexual fantasies about one’s own partner contribute more to a relationship.