Red is the color of "stop," but it’s also the color of love, and a woman wearing red is often seen as giving "go" signals–either intentionally or unintentionally–to the men around her, and it makes men feel more amorous towards women too: When a man takes a red-wearing woman on a date, he’ll spend more money on her.
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It’s interesting to consider why the color red sends the same message everywhere: danger, hot, stop. It also means dominance–athletes wearing red (as the Giants did in the recent Superbowl) seem to win more often.

It could be explained because red is the color of fire, but it’s unlikely that it would assume the same meaning in almost every culture–unless it’s part of human evolution. Primate studies reveal that this may indeed be the case.
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…on Valentine’s Day – Red is for winners (and also for lovers). From the red used in ancient rituals to today’s red hearts on Valentine’s Day, the rosy hue has been tied to carnal passions and romantic love across cultures and millennia. Now scientists have demonstrated that the color red makes men feel more amorous toward women (but men are unaware this).

Psychologist Andrew Elliot says, “It’s fascinating to find that something as ubiquitous as color can be having an effect on our behavior without our awareness.”
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