Sexual Relationships 
Sexual Health 
In the US, before the mid-1800's, first cousin marriages were legal in all states. Now, in a bare majority of states, sexual relationships and marriages of first cousins are still legal. And in the remainder of the world, first cousin marriages are legal. . . and even encouraged in some cultures. The incidence of genetic defects in the offspring of first cousin matings are only slightly greater than the incidence in the offspring of unrelated couplings.
Assuming that first cousin marriages were legal where you live, how would you feel if you learned that one of your best friends was having a sexual relationship with his or her first cousin? Would you accept it, condemn it, be grossed out, or remain entirely neutral on the subject?
What Girls & Guys Said
9 17In Muslim countries, marriage with first cousin is legal but now medicly approved, that children from this marriage, have some physical problems
Keeping anonymous for obvious reasons. I have had a relationship with a cousin but not first.
We kept it secret because while it's not illegal people frown about it.
Given the opportunity I would with my first cousin.
Not anymore but I've had consensual sexual contact with a cousin twice