I have heard that men find women dressed in red more attractive (I can confirm this from personal experience as well).
What color or colors do women prefer on men, if any?
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The initial report of men finding women more attractive in red or even with a red background on a photo did receive a lot of press. However, the study has since been done in reverse. Women tend to find red more attractive on men as well... or even with a red background on their photo.