@BillRM,
By law, how many children must you have to get married? How long after getting married does the law demand that you have a child before it revokes your marriage?
If now you want to talk about the potential to have kids, why can't we talk about gays adopting?
"You don't raise children so you contribute less to society"
"But, I'd love to raise a kid. I've got a good home. Can I adopt one?"
"No. You're gay."
"But if I could help raise homeless children, I'd be helping out; I'd be contributing."
"Yes, but I can't let that happen."
It's pretty circular argument. You think gays don't deserve the marriage because they don't do X, and Y. Many people who can do X but choose not to can get married, but not gays. Many people who don't do Y can get married, but not gays. Gays can't do X without science. You want to prohibit them from doing X. Gays can't do Y, because You won't let them. You'll let a straight couple who plans to do neither X or Y get married, but you won't let gays do it when they can and are willing to do either or both.
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