To begin to understand why Katy Perry is not attractive you must first educate yourself about a little thing known as the uncanny valley.
http://en.wikipedia.org/wiki/Uncanny_valley
Once you realize that both feet face and mannerisms are freakishly unnatural, it doesn't matter that she has a 9/10 body anymore, you cannot unsee her face.
The perfect example would be to directly compare her to someone who looks much like her yet doesn't enter the uncanny valley. Zooey Deschenel.
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