According to CNN.com,
[The researchers] "think that red, due to the association with hearts and
Valentine's Day and lingerie and things like that, takes on a sexy meaning,"
says Elliot. "There's also a possibility -- a rather provocative possibility --
that there's a deeply embedded sort of tendency for heterosexual men to see red
as an attraction cue because that's what happens in the wild."
Really? Sex organs become engorged with blood during arousal, which makes vaginas red. And nipples red. And lips red. None of which are inherently sexy except that you usually only see them when you're about to have sex. Which is sexy.
Incidentally, I'm wearing a red sweater today. And, of course, I have red hair. Hmm.