So if two people are not married and they have a child the man is not considered to be the father? The mother is not considered a mother? What? That doesn't even make sense. What about the financial benefits they receive even if they have no children? Marriage in its current form is discriminatory; if it was just for children then I would understand; if it was just a religious practice then gay people would have no standing; but it is none of these, it is a protective, beneficial and financial legal contract. Our government has redefined (restructured) marriage when it started providing benefits to those who formed a union.
Then you should have no problem with same-sex couples marrying. <<<Mod Edit: Personal Attack Removed>>> Your entire argument hinges on it - biological procreation and the regulation thereof. If procreational ability is irrelevant (say what now?..) there is absolutely NO reason to refuse marriage licenses to same sex couples. Not one. That's probably the biggest load of BS I've heard since I started posting on here. You've nothing to regulate if two people can't procreate, going by your definition of what marriage is. The only "interaction" you're talking about is PROCREATION. To make babies one must be able to procreate, hence.. the ability to procreate. By your logic, If you lack that, like gay and sterile couples do, what is there to regulate? WHY give them the privilege? Simply because they are heterosexual? Unconstitutional.
Your entire argument hinges on the assumption that the SOLE purpose of marriage is to regulate procreation (as in to make fathers accountable for their actions and make single mothers less of a burden on the state). Whilst it has that effect, it is not stated anywhere in the legal system that this the only purpose it serves. If it was, then sterile/barren couples would be excluded. It's as simple as that. In reality marriage rewards stable homes, encourages commitment, and generally makes people's lives easier. These are all things sterile couples enjoy despite not having anything to "regulate", so clearly we see a gaping hole in your theory.