Women are more attracted to men in red according to recent research: Red, Rank, and Romance in Women Viewing Men [pdf].
…in a series of 7 experiments we demonstrate that women perceive men to be more attractive and sexually desirable when seen on a red background and in red clothing, and we additionally show that status perceptions are responsible for this red effect. The influence of red appears to be specific to women’s romantic attraction to men: Red did not influence men’s perceptions of other men, nor did it influence women’s perceptions of men’s overall likability, agreeableness, or extraversion.
Considering how common it is in the animal kingdom, this shouldn’t be surprising. Even in in modern humans it’s common, for example red lipstick.
Still it’s interesting that something like color can have an impact on a person.