Here's a riddle for you. It is something that polite people do not discuss. It is something that most television shows do not dare to mention. It is something that half the world can never know or experience. It is something that more than half of the writers in the world can never truly understand. In Speculative Fiction, it creates the Monster of the Week and brings about The End of the World as We Know It. What is it? Menstruation in Speculative Fiction also causes mundane misery and angst, which tend to lead to stupid mistakes that create all of the previous supernatural problems.