Genesis 2:24 Therefore shall a man leave his father and his mother, and shall cleave unto his wife: and they shall be one flesh.
Those who wish to waste their time debating with perverts and their apologists about marriage should remember one thing, THERE IS NOTHING TO DEBATE.
Genesis 2:24 sets the definition and bounds of true marriage. One male and one female anything outside that is perverse.
Marriage is also the Spiritual illustration of the relationship between God and the one true Church made up of the elect.