So according to you beliefs if a hetro couple who is sterile and can't have kids or a couple who does not want to have kids at all should not get married or have the right to get married because they would not be child rearing to use your words.Since when does the state have the right to make such decisions regarding marriage or any other personal relationship between consenting adults.I seen nothing in the constitution that permits the state to get involved in any way whether it is 'defining' marriage or discriminating on that basis.