People playing a two-person monetary investment game over the internet while viewing a picture of the �second player� were more likely to trust this player if the picture was digitally morphed to resemble the first player (DeBruine, 2002). This is candidate evidence of human kin recognition by phenotype matching. The proximate mechanism for this effect may include a greater perception of attractiveness for self-resembling individuals. In an experimental study using computer morphing techniques, I found that self-resembling faces are judged as more attractive by the individuals they resemble than by other individuals. In addition, differences in attractiveness judgments depend on the sex of the judge and the sex of the face being judged: identically produced facial resemblance increases the attractiveness judgments of same-sex morphed faces more than other-sex faces for both male and female subjects.
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