A study published online today in the Personality and Social Psychology Bulletin suggests that women see women wearing red as sexual rivals. The researchers asked two groups of women to view a photo of a woman in her 20s. In one test, about half of the women saw a photo of the subject wearing red, while the other half saw her wearing white. Participants who saw the woman in red rated her as “more sexually receptive” than her mirror image in white, Pacific Standard reports. In a similar test, women reported that they were more likely to guard their significant others from a woman in red.