Even though every major religion has defined marriage as a lifetime commitment between a man and a woman, some in the 21st century want to redefine it. But even if you leave God out of the discussion, there are good reasons why mankind defined marriage that way:
1. For the civilization of men. Men have a tendency toward violence and to be animalistic when lustful passion strikes. Society has seen marriage as a protection against that.
2. For the protection and security of women. Men are physically stronger, and because of man’s animalistic tendencies, marriage has historically been for the physical protection and security of women.
3. For the welfare of the children. Growing up in a family with a healthy and stable marriage between a man and a woman has been the best environment for a child’s development and maturity. It’s how children learn to deal with men and women responsibly and respectfully.
The civilization of men, the protection and security of women, and the welfare of children are three key reasons that marriage is to be between a man and a woman.