A sticker is seen in a window in a gay-friendly section of Philadelphia ...

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Mon Jul 30, 10:02 AM ET

A sticker is seen in a window in a gay-friendly section of Philadelphia known as the 'gayborhood,' June 13, 2007. Philadelphia has become more sophisticated in its effort to attract part of the annual $55 billion gay tourism market, targeting subgroups within the gay and lesbian community.

(AP Photo/Matt Rourke)