Claire thought about how taboo some things are, how freeing it would be if some of these taboos could finally be broken. One of the most taboo things had always been violent sex, especially the more extreme stuff, she thought about how great the world would be if a taboo like that had been completely broken.
She checked the book's rules, she could do basically anything other then human extinction, and it would be reversible. 99 percent of people wouldn't remember the change, and no matter what history wouldn't be significantly altered and everyone would always exist in some form somehow.
She turned the book to the section about sex and began rewriting some things. In the end she created new rules for humanity: humans sexual desires are the desire to either feel pain or cause pain, most people like the sensation of pain when it's in a consensual context. People enjoy hurting eachother and being hurt by eachother as their primary form of intimacy. There is no sexual pleasure outside of violence, people don't even have genitals as those aren't needed for pain. People still might be violent for nonsexual reasons, and nonsexual violence is treated normally. Humans reproduce when their blood mixes or when one human consumes the other's blood.