Dating cousin by marriage
It is permitted under Torah law for cousins to marry.
In fact, the Sages seem to view marriages between relatives as desirable.
If you're afraid of mandatory genetic testing and you'd prefer to ban marriage among people in high-risk categories, why not start with fertile women over 40? Cousin couples compare laws against cousin marriage to laws against interracial marriage. Why is an increase of 50 to 100 percent no big deal?
At worst, said one of the study's authors, when cousins procreate, "'93 percent of the time, nothing is going to happen." What about the other 7 percent?
Many cousin couples can't pass on genetic diseases, since they're infertile. If not, maybe the 24 states that ban cousin marriage should follow the lead of the five states that allow it if either party is sterile. If your purpose is to prevent people with dangerous genes from marrying each other, why use a crude standard such as kinship?
And if procreation between first cousins is too dangerous, why stop there? Why not test everybody for bad genes, ban marriage between carriers, and let cousins without bad genes marry each other?
The authors instruct genetic counselors to focus on "validating feelings" and helping cousin couples "normalize" their relationships by explaining how common cousin marriages are. What if, in addition, your dad and my dad are brothers?The Talmud recommends that a person marry his niece (Yevamot 62b).