Mostly monotheist religious moral standards in the modern world that wants to own and control women and fears women's sexuality. Monotheistic religions backed by empires and violence. There is nothing moral or amoral about consensual sex between adults. The sooner we rid ourselves of religion and the faux morals spawned by it there better. Granted, I think people should have sex because it is fun and they want to, not because some faux god or moral standard told them it is ok or not. Great article!