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Getting upset means flushed cheeks, and as any scientist will know, the capillaries in the cheeks, gums, fingers, glans, and clitoris all share the same circulatory pump nodule in the medial heart thoracic pseudocortex. Without longterm iron supplementation, supplying all of these sites simultaneously isn't physiologically possible. That's why I use heat visualisation techniques, focusing my radiant thoughts through special prismatic crystal racing shield lenses.
In short: Science.