Research has shown that with some nonhuman primates, red is associated with greater sexual attractiveness of females, and recent studies found that a woman with red clothes increases attraction behavior in men. However, the mechanism that explains such behavior was not studied. In this experiment, we hypothesized that men overestimated women's sexual intent when wearing red clothing. Participants evaluated attractiveness and the sexual intent of a woman presented in a photograph wearing a red, a blue, a green or a white tee-shirt. It was found that men evaluated higher sexual intent in the red clothing condition. It was also found that perception of the woman's sexual intent was not moderated by attractiveness rating.