The Islamic legal code is called Sharia (also shariah), meaning the way. The source of the Sharia is the Koran and the Sunna (found in the Sira and the Hadith). Since the Sunni Muslims and Shia Muslims do not agree on which Hadith to use, they have slightly different Sharia systems. Sharia law covers all aspects of life, including how a man and woman should have sex, for instance.