It would promote monogamy in a section of society where promiscuity has been the norm. Increases in log term monogamy would reduce STD transmission through promiscuity and unsafe sex.
Simplified parental rights for same-sex parents raising a child.
It prevents even further complication of beneficiary, tax, and medical decision laws instead of adding a new category for "Civil Unions".
Increased economic advantages to the tourism and wedding section of the economy.
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Do you have links/evidence where this has happened in the states that legalized 'same sex unions'?
Promoting Monogamy? Common Sense. It's hard to catch an STD when you are in a monogamous relationship.
Parents? Recognizing parents as parents would not make things simpler?
Tax Code? Are you implying that adding a whole new level to tax codes for States and maybe eventually to the Federal Code for Civil Unions wouldn't be more complicated?
Economic Benefit:
"From June 17 to Nov. 4, 2008, when such weddings were allowed before California voters banned them, the San Francisco county clerk issued 5,152 marriage licenses to same-sex couples, said Ted Egan, an economist with the city controller's office. Fewer than half, 45 percent, were city residents, he said in court testimony in 2009. Egan projected that the ban would cost the city about $35 million in annual economic activity."
"The “NYC I Do” campaign “will create millions of dollars in additional economic impact to the city’s $31 billion tourism industry,” Kimberly Spell, a spokeswoman for NYC & Company, the city’s marketing office, said yesterday in an e-mail. Bloomberg will unveil more details in coming days, she said."
"An analysis by the New York City comptroller in 2009, the last time gay marriage was debated in New York, found that the practice would push $210 million into the state's economy over three years. <P> The city's tourism agency is developing a campaign called NYC I Do to make it "the gay weddings destination," which it said could create "hundreds of millions of dollars in additional economic impact."
Seeing an economic boost from same-sex marriages | Philadelphia Inquirer | 07/03/2011
New York City Plans Campaign to Woo Gay Weddings - Businessweek
Wanna cash in on gay marriage? New Yorkers say 'I do' - USATODAY.com
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