Organizers said they expected 1.5 million people to attend the Eighth Annual Gay, Lesbian, Bisexual and Trans-gender Pride Parade, which would make it the world's biggest gay event.
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Civil unions between same-sex couples are permitted only in Brazil's southernmost state, Rio Grande do Sul. While the practice has not spread to other states, the unions have stirred surprisingly little controversy in this predominantly Roman Catholic country.
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Sao Paulo Mayor Marta Suplicy gave a speech to open the parade, as she did last year, proclaiming her pride in the city's diversity.
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Revelers unfurled a 50-meter-long (55-yard) rainbow flag, and health ministry workers distributed 50,000 free condoms.
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http://www.cnn.com/2004/WORLD/americas/06/13/brazil.gay.parade.ap/