The risk to offspring is definitely higher with certain genetic diseases than with relatives.
The case against incest can be made on that base when eugenics are re-established and codified into law. As-is the only argument that holds water is "yuck" - one that same sex marriage proponents should be vaguely familiar with.
The case against incest can be made on that base when eugenics are re-established and codified into law. As-is the only argument that holds water is "yuck" - one that same sex marriage proponents should be vaguely familiar with.