One common argument against gay marriage, most famously used to defend California’s now defunct Proposition 8, is that marriage exists solely for a couple to have and raise children, thereby implying that biological parents are best for child welfare. Using his research into adopted parenting outcomes, Kyle Gibson argues that same-sex couples actually make excellent parents because they must put additional thought and effort into getting children in the first place. He concludes that if the advocates of Proposition 8 are truly concerned with reproduction and childrearing, they are left without a valid argument
