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Perrett, D.I., Penton-Voak, I.S. best computer sex games, Little, A.C., Tiddeman, B.P., Burt, D.M., Schmidt, N., Oxley, R., Kinloch, N., & Barrett, L. (2002). Facial attractiveness judgments shine learning of parental age characteristics. Proceedings of Biological Science, 269, 873–80.