Now a study by the National Society of Genetic Counselors says that having a child with your first cousin raises the risk of a significant birth defect from about 3-to-4 percent to about 4-to-7 percent.According to the authors, that difference isn't big enough to justify genetic testing of cousin couples, much less bans on cousin marriage.

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You can't just say the practice in question is icky.

You have to state a principle and think through its implications. You can't appeal to Victorian morality; Queen Victoria married her first cousin.

Beyond reconnecting with aunt Brynhildur, some Icelanders are using the site to avoid romancing the bloodline. In North America, donor sibling registry websites help children of the same sperm donors get acquainted, but also alleviate some concern that the child may one day fall for a relative, as large groups of half-siblings are beginning to appear with the rise of artificial insemination.

“Some experts are even calling attention to the increased odds of accidental incest between half-sisters and half-brothers, who often live close to one another,” Jacqueline Mroz wrote in The New York Times.

Often, you have to change your opinions on related issues in order to honor that principle, or you have to throw out the principle and change your mind about the original question. You can't appeal to the Bible; in the Bible, God commands marriages between first cousins.

From this, the media have concluded that marrying your first cousin is "OK." Is it?

As Frame Game has argued before, topics such as sex with animals, dog-eating, and sex with cousins are never as simple as they're made out to be.

“My daughter knows her donor’s number for this very reason,” one mother of a teenager conceived through sperm donation told Ms. “She’s been in school with numerous kids who were born through donors.

She’s had crushes on boys who are donor children.” Would you ever use a genealogical database or donor registry for this purpose?

No jocks, smokers or brothers: An online database is letting people on the tiny island of Iceland (population approximately 318,000, or less than Halifax) double-check that they aren’t about to date a distant family member.

Islendingabok, or the Book of Icelanders, tracks 1,200 years worth of the country’s genealogical data. “When you live in an isolated nation with a population roughly the size of Pittsburgh, accidentally lusting after a cousin is an all-too-real possibility.” The site alerts Icelanders to familial overlap and also reveals ties to Bjork: One man learned that his ex-wife was his seventh cousin – not technically incest – and that he was related to the eccentric singer seven generations back.