This is where sexual preference comes in. How about if I preferred young children, hmmm? Would I be granted the right to amend the laws to allow me to marry one. But, that's not fair. How about if I preferred farm animals? Not fair, I would cry.
Subject closed, as far as I am concerned. Life is not always fair, and you cannot pass laws to make it so.

Been there, done that, the washing machine ate the T-shirt