It's no accident that the oxmoronic concept of "homosexual marriage" was unheard of in the 1800's; it's about as legitimate a notion as a "square circle".
Cordially,
Definitions:
Circle: A plane curve everywhere equidistant from a given fixed point, the center.
Square: A plane figure having four equal sides.
Now, just for fun, Draw a square with 4 sides of infinite length and see if the result does not also fit into the definition of a circle.