Why not? Commit to each other and stay together.
You could say the exact same thing about hetero couples.
Oh, you want to compel others to give special treatment to the pair.
What? Where do you see special rights? They want equal rights. Meaning they want the same exact right that you have - the right to marry the person they choose.
Why? It's not like they're going to reproduce together. See my prior post explaining "marriage"; you seem confused about the purpose of the institution.
No, you are the one who seems to be confused about the institution of marriage.
There are TONS of hetero couple that are unable to have children, are you saying that they shouldn't be allowed to get married?
There are TONS of hetero couple that are able to have children, but they choose not to. Are you saying that they shouldn't be allowed to get married either?
Marriage historically was always a business union. I don't know where you got the idea that it's exclusively for producing children, because that's not and has never been what marriage is.
Heck, even if you look at the standard totally religious wedding vows, nowhere does it say that marriage is about producing children.
http://www.unionoflove.com/vows/stdvow.html
And on top of that yet again, we're discussing LEGAL marriage here, not religious marriage. If your church doesn't want to perform gay marriages, then it doesn't have to! If you personally don't want to recognize gay marriages as being legitimate, then you don't have to! All we're talking about here is the LEGAL side of marriage, things like having the law consider your husband or wife to be your next of kin who gets to make your medical decisions if you're incapacitated, etc.
Frankly, if you believe in marriage as an institution, and as a religious union, and as a small government issue, then you should want to get government out of the role of declaring marriages altogether. Do you really want the government to have authority over who you can choose to marry? Do you really want the government to have the power to dictate to your church who they are and are not allowed to wed? Government should ONLY have the power to declare any two adults as being in a legal domestic partnership, be they a homosexual couple or a heterosexual couple. The freedom to decide who is and isn't recognized as being legitimately married should be left up to you as an individual, and left up to the individual churches and religious organizations.