Talk:Eris Boreas Greyrat/@comment-122.200.8.27-20141128081551/@comment-97.121.38.20-20151207081002

And it was mostly taboo because people didn't understand how genetics work.

The chance of birth defect in children from siblings is a little higher, but the chance of birth defects in the children of cousins is about the same as two unrelated people. So there is no scientific reason for cousins not to get married, and as far as morality goes, that was thrown out the window when we decided gays could be married. Morality is not a legal reason to keep people from marriage anymore.