One most disenchanting for human narcissism but most plausible example of Darwinian learning theory applied to emotions is Johnston’s work on beauty and erotic partner selection, for which he won a scientific award. To prove that our feelings for beauty and sex appeal do not follow arbitrary individual patterns but the stern rules of the "net reproduction gain," Johnston invited the world to choose the most attractive female and male faces of those he posted on the World Wide Web. Statistical evaluation demonstrated that from full lips (due to little fat cushions after estrogen rise in puberty) to the hip-waist ratio for the pelvis most likely to deliver without complications, every sign of sexual attraction is in fact related to the "net reproduction gain," i.e., the likelihood to win the most fertile and successfully delivering woman. The attractiveness of male faces seemed to rest mainly with signs of health and physical strength. Furthermore, according to the selection experiment, our feelings are tuned to the age of highest fertility. Again, these cues cause exaggerated feelings, in the sense of a "discriminant amplifier," to waste not even a minimal reproduction advantage.