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A significant genetic effect was found that influence variation in both measurement of mate preference towards altruistic traits and the preferred trait. The findings support the relationship between sexual selection and human altruism towards non-kin.

Response on the commentaries of Karen Wynn and Dale Hay on the author's study about the roots of altruism among human beings is presented. Details regarding the role of experimental and observational processes and the response on the possibility of selectivity among infants in displaying altruistic behaviors with other people are discussed.

The study examines the roots of altruistic behavior among humans by observing toddlers 14 to 18 months old. Human infants are shown to help others achieve simple goals, such as reaching objects, showing that they are naturally altruistic. Social contexts and feedback from interactions are shown to mediate initial altruistic behavior in humans.

The role of altruistic traits in human mate selection is examined. Results confirmed the presence of mate selection which is based on altruistic traits. Mate preference towards altruistic behavior among women is examined.