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Good looking people tend to have bigger foreheads. Although in the real world that applies to men much more so than women. Look at any mainstream celeb that girls like, like Robert Pattinson, Johnny Depp, Ed Westwick. They have big foreheads, which is perceived as good looking. Girls like Olivia Wilde and Rachel McAdams are really hot and have big foreheads too. In the anime world, girls tend to have them more though, and look better.