Prosocial behavior: any behavior that has the goal of helping another person. This is sometimes motivated by desire to improve one"s own circumstances. Child shares toy with sibling because her father promised her a cookie. Altruism: helping without expectation of personal gain, purely unselfish behavior. British columbia suggested that those who were more religious were more likely to engage in prosocial behavior. Kinship selection: this theory is used to sum up why parents may self-sacrifice; that is, put themselves in positions of danger for the benefit of the child. Evolutionary theory views behavior as shaped by the motivation to ensure the survival of one"s genes. Because helping others leads them to reciprocate, this type of cooperation among group members increases survival: men and women vary in their likelihood of helping in different types of situations. Men are more likely to help in dramatic life-and-death cases (saving someone"s life).