Its completely legal, but definitely not as common as it once was. It was once common practice, but marrying your cousin has fallen out of fashion in recent times – thankfully, some would say.
Is it bad to sleep with your second cousin?
To be clear, what we mean when we say its okay for cousins to marry is actually that its okay for cousins to sleep together. There are no real health risks posed by a piece of paper. Really, this is about sexual intercourse.
Is marrying second cousins legal?
In the United States, second cousins are legally allowed to marry in every state. However, marriage between first cousins is legal in only about half of the American states. All in all, marrying your cousin or half-sibling will largely depend on the laws where you live and personal and/or cultural beliefs.