Procreation and child rearing being functions of heterosexual behavior, and marriage being the institution regulating said issues, among others.
If one cannot be made to fit the description, one should not be assumed to be included.
Does it really need to be said that gay people are perfectly capable of procreation and child rearing? Just because occasionally heterosexual behaviour leads to procreation, does not mean procreation should be only allowed to those who keep behaving in such a way. Neither does it mean that procreation is the only allowed result of such behaviour. Neither does it mean that it is the only function of marriage, it does not even mean that it is a required function of marriage.
Your description of marriage is flawed, as are consequently, your arguments regarding it.
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