Why would you have to "pay for" my children? WTF are you even talking about?
Tell you what, without legal recognition of my partnership, if something were to happen to me, you'd be paying for my children. They'd be wards of the state because my partner wouldn't be their legal parent. (which she wouldn't be in a number of states that don't allow 2nd parent adoption by same sex partners)
As for "paying"...thanks to the unConstitutional DOMA, I already pay considerably more than heterosexual couples.
Ending the Gay Health Care Tax
If you did not set up your family relationship correctly, it's no one's fault but yours. You could have set up a legal guardianship for your partner. If you didn't care enough to protect your children, why should anyone else?
Ah...so in addition to the $120 health care tax I pay every month, I should also have to pay thousands of dollars to a lawyer to set up a fraction of the legal protections you get with a $50 marriage license because I'm gay? Really? And the legal basis for your argument would be what?
You could do it yourself, it's not that complicated. People who make a choice to live their lives in an situation slightly outside of the normative parameters have to do the same thing. It's no different than a couple that lives together making the choice not to marry and finds out that the father of the children has never established legal parentage. If you wanted to have a two parent household, you could have married a person of the opposite sex. Just like everybody else. It's called equality.