But They Love Each Other!

There are reasons for defining the parameters of marriage. Some are more discernible, others less discernible but just as important.

From Fox News, here's one that's more tangible:

A German brother and sister who have four children together are calling for the country's incest laws to be abolished so that they can continue their sexual relationship.

Patrick Stubing and his sister Susan — who grew up separately — have had three of their children taken into foster care.

Two of the children have disabilities although it is not known if these are due to inbreeding or because they were born prematurely.

Whether these children suffered birth defects because of the close relation or not, it is a scientific fact of genetics that children of close relations have a greater risk of birth defects. That is why we have laws against incest: to protect children from unnecessary harm.

That is also why we define marriage as between one man and one woman: so that children aren't subjected to the loss of a male or female role model, and subjected to an emotionally unstable lifestyle.