The historical definition of marriage certainly did presuppose procreation. However, the modern institution of marriage, which has been co-opted by the State, has no such authority to demand sons and daughters.
The funny result is : a society that doesn’t procreate dies.
Goodbye.
Just the fact that if all turned gay, the human race would disappear, is more then enough proof homosexuality is wrong. By saying not all couples want kids is not the point, the point is they have the capability to create a child but 2 same sex ppl cannot.