re: #79 Justanotherhuman
Yes, but the risk of birth defects doubles in cousin marriages, even though they’re legal in most countries, including many states in the US. It’s the same risk as that of women who have children when they’re over 40, 4-6%.
I think “cousin” marriages were more likely a function of arranged marriages which included social, religious and economic considerations. People in earlier times didn’t have the means to get around as we do in modern times and often didn’t leave the county they were born in.
Mongolians had to steal their brides from another tribe -no?