Emotional cheating can look like secretive, sustained closeness with someone who's not your primary partner. Men tend to get more upset about physical infidelity while women are more concerned with cheating associated with intense emotional disclosure. Some psychologists have suggested that this stems from the primitive reason behind why we take partners or accept monogamy in the first place. Someone who is narcissistic is more likely to cheat as they also seem on an emotional level to want a boost of self-esteem. Having sex with a new person could lead to positive internal feelings and make you feel empowered - even though you haven't had much previously.