Altruistic prosocial behaviors were defined as voluntary helping motivated primarily by concern for the needs and welfare of another, often induced by sympathy responding and internalized norms/principles consistent with helping others (Eisenberg and Fabes, 1998). Moreover, because the helper is primarily concerned with the needy others’ welfare, these behaviors sometimes incur a cost to the helper. Although scholars have debated whether altruistic behaviors exists (see Batson, 1991), there are at least 3 lines of evidence that support the existence of altruism (Eisenberg et al., 1999). First, researchers have presented evidence of the heritability of sympathy (e.g., Matthews et al., 1981) which is deemed evolutionarily adaptive. Second, there is longitudinal evidence of stability in the tendency to behave in a prosocial manner across childhood and adolescence (Davis and Franzoi, 1994; Eisenberg et al., 1999). And third, researchers have found significant associations between personality variables and prosocial behaviors across different contexts (Carlo et al., 1991a; Staub, 1978).