“It is a particularly modern solution to a medieval injunction: According to an obscure ruling in Islamic law cited by the Islamic State, a man must ensure that the woman he enslaves is free of child before having intercourse with her.” From Rukmini Callimachi: To Maintain Supply of Sex Slaves, ISIS Pushes Birth Control. This is a brutal but important story. Sex, both its repression and its violent outbursts, is an absolutely fundamental aspect of the rise of terrorism.