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Why does lust demand beauty? In humans as in other species, the urge to indulge in sexual display with concomitant activities is probably to some degree innate and is certainly influenced by internal and also environmental stimuli and inhibitors. The establishment of feudalism in Europe freed the warrior caste from bondage to agricultural and craft labor, and their military and police obligations became episodic. Their existence became only the more public, a display of signals. In order to be effective, signals have to be reliable; in order to be reliable, signals have to be costly, argue ethologists Amotz and Avishag Zahavi. If the signaler could have given the opposite signal and gained thereby, the signal that he did give at a loss is credible.2 Their display behavior became more and more elaborate.



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