Kissing Cousins: How Does Incest Affect The Health Of Offspring?

Incest, usually defined as sex between close blood relatives, is one of the
most pervasive sexual taboos across cultures. Many different theories have
been advanced to explain this taboo, but perhaps the most common is that we
evolved to avoid incestuous relations because inbreeding increases the odds
of health problems in any offspring produced.

So just how risky is incest anyway?

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