Two consenting adults, including relatives?

[Rahul]

I remember a couple in Mexico who were very much in love. They were too cute and happy. They decided to get married and began the process for the wedding. The court sent them to get medical routine exams in order to go through with it. Turns out they were siblings. They wanted to die. They never knew.

That's the weird thing. Close relatives that weren't raised together and then meet frequently have a strong attraction to one another. Whereas if they did grow up together they aren't.

There was a case just earlier this year where a mom found her son that she had given up for adoption as a baby and they were arrested for having a sexual affair. I think the son was still a minor at that.

I've read tons of stories about lost siblings hooking up without knowing they were related.

In Iceland there are only like 300,000 people that are all descended from a group of Vikings that colonized the island a thousand years ago or something. They even developed an app so they could keep from hooking up with close relatives that they didn't realize they were closely related to.