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Katy Perry says she won't date non-famous men. She told Rolling Stone, "I've done that before. There's a level of understanding when they're in the same business.  They understand what it means when you're tired from a show or the tour's exhausting you or if an interview went wrong -- they know all the ins and outs, so you can just walk in to the house with a certain face and they understand.  Rather than having to explain everything.