Believe it or not, when a woman is at her most fertile phase she rates notably higher on measures of racial bias:

Although a considerable body of research explores alterations in women's mating-relevant preferences across the menstrual cycle, investigators have yet to examine the potential for the menstrual cycle to influence intergroup attitudes. We examined the effects of changes in conception risk across the menstrual cycle on intergroup bias and found that increased conception risk was positively associated with several measures of race bias. This association was particularly strong when perceived vulnerability to sexual coercion was high. Our findings highlight the potential for hypotheses informed by an evolutionary perspective to generate new knowledge about current social problems[mdash]an avenue that may lead to new predictions in the study of intergroup relations.

Source: "Race Bias Tracks Conception Risk Across the Menstrual Cycle" from Psychological Science

I'm guessing this isn't perceptible but if you're a woman who gets the urge to fill out a KKK application on a monthly basis, post a comment.

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