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The level of disparity in hottness of a girl between two time periods based on natural selection. The natural selection theory is based on the hypothesis that hott girls with be chosen by dudes more often, and will not work as hard to maintain their looks, becoming ugly. Reversely, an ugly girl will work hard to get laid and become hott. High Bitchisity + Hott = Bad; Low Bitchisity + Hott = Good High Bitchisity + Ugly = Good; Low Bitchisity + Ugly = Bad
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