Machiavellianism

A recent study shows psychopathy and Machiavellianism, but not narcissism, influence perceptions of infidelity. For instance, Machiavellians don't usually consider fantasizing as infidelity, and psychopaths don't tend to view sexual acts as infidelity.

Study of 622 people finds that rich people are as generous as the middle class are, although the rich score slightly higher in Machiavellianism and narcissism. The rich are about as psychopathic as the poor are.