One of the most lethal aspects concerning "gay marriage" is that it opens the door for a host of sexually deviant "marriages."
Legalized beastiality will be on the horizon, what with all the animal rights activists creeping in laws (s - l - o - w - l - y) so as not to alarm the American public. They'll follow suit the way the LBGT community did with getting "gay marriage" on the agenda. People will laugh and scoff at me for suggesting this crazy notion, but ask yourself, if I had mentioned 30 years ago that the US Supreme Court would be seriously considering "gay marriage" you would have laughed me out of the room.
Pandora's Box is wide open now.