Why does the topic of gay marriage include the topic of getting married to animals and siblings that we love?
Gay is gay. Animals are animals. Siblings are siblings. Apples are apples. Oranges are oranges.
Loving our pets is that. Loving our siblings is that. A gay couple in love is that. Three different things.
And religion is also always brought in - but we aren't a right-wing theocracy in the U.S. so why is that supposed to be something for everybody to consider for this topic?