Article 16, Universal Declaration of Human Rights

(1) Men and women of full age, without any limitation due to race, nationality or religion, have the right to marry and to found a family. They are entitled to equal rights as to marriage, during marriage and at its dissolution.
(2) Marriage shall be entered into only with the free and full consent of the intending spouses.
(3) The family is the natural and fundamental group unit of society and is entitled to protection by society and the State.

Unless I am misreading this, I don’t think it actually specifies what a marriage is. It just says that men and women shall have the right to marry. 

So – men have the right to marry, and women have the right to marry. But nowhere does it say they have to be married to each other. 

Just saying 🙂