All this 'marriage' stuff is nothing more than trying to 'normalize' that which is not normal. If their lifestyle is so okay, then why are they, as a group, trying so hard to pattern themselves after society's norm? Especially when they go to such great lengths to show how truly faulty it is when examined?
Christ used allegories about the bride and the bridegroom. So marriage is a sacrament, but not all Protestant denominations use the term "sacrament."