Most people—and I say most because you know some people out there are like this—don't have an attraction to their first cousins. Getting married to a blood relative is icky and can really mess things up genetically if they have children. That's why 31 states make it illegal to marry your cousin, including in Illinois... well, kind of. While 31 states with laws on the books about making it illegal to marry your cousin or any blood relative seems low, wait until I show you which states are "cool" with it.