Gay marriage: mating and mating less

The traditional institution of marriage acknowledges that a man and a woman have mated with each other, regardless of accuracy of any particular marriage. The (gay) redefined institution of marriage acknowledges that a man and a woman have never mated with each other, regardless of accuracy of any particular marriage. To honor, to have and to hold, to love and to cherish are reasons for getting married and is purely optional, regardless of accuracy of any particular marriage. If the traditional institution of marriage doesn't differentiate mating from mating less if a baby is not produced then what does? What can?

misterhunter: Perhaps one could argue that the exchange of both vaginal and seminal fluids within a single mated pair defines the traditional marriage from the (gay) redefined institution of marriage?

However, that definition is broad enough that it encompasses other nontraditional institutions - polyamory, for example. Transgender situations (where one person switched from the opposite to the same gender as their mate) would also still fit that definition.

misterhunter: The traditional institution of marriage acknowledges that a man and a woman have mated with each other, regardless of accuracy of any particular marriage.
What about childless male-female couples?