What's The Big Deal About Gay Marriage??

I just don't get it, what's the hoopla all about, why can't 2 people ( or 3 or 5 ) who love each other get married? You know, we dogs have sex with each other all of the time, sometimes my 2 sisters hump and attack each other just like real human couples do, sometimes my sister Lola has sex with a pillow, I sleep with my brother Boo, we are not hurting anyone so what's the big deal? Mom says that some small minded people have problems with gay people and that gay people have been around longer than anyone even knows about like before she was born! I think she said that back then they were called hairdressers or priests or something like that........