Thank you for clearing that up. I just couldn't wrap my mind around it.
I just found a related
article.
Its called "First cousins want right to marry; science agrees"
I'm asuming "science agrees" means that there will not be at a significantly higher risk of birth defects in the offspring of first cousins. Incest laws are in the process of being changed, but many politicians are reluctant to support the repeal, and rightfully so.
Even if the laws are repealed, how long will it take America to accept that idea? I'd guess 50 years or more. I really don't think it is the type of thing that people would just readily accept-- legal or otherwise. I know I still look down on it.