Cousins? I'll forgive cousins. It's bad for the gene pool, but that "sick" feeling you get when thinking about having sex with your siblings and parents is actually about proximity to people when you grow up.\n\nKids raised communally will often refuse to have sex with each other because they have a "sibling" response.\n\nThese two cousins obviously didn't spend enough time together as little kids to desexualize each other.