a metrosexual is simply a man who is unashamed of indulging his vanity, and is stylish enough to get away with being vain.
it isn't about sex, and it's never applied to women. it's just a man who hasn't quite crossed the line into narcissism. avoid him all the same; like the song says, a man shouldn't spend more time on himself than he does on you.
custer was a metro sexual. william shatner is vain, but he's not a metrosexual. currently, most true, heterosexual metrosexuals are black men and italian american men.