Historically, Gampopa (12th century), one of the main early masters of the Kagyu school of Tibetan Buddhism, followed the Indian Buddhist tradition, starting with the 3rd-century Hinayana texts of Vasubandhu, and stated that oral and anal sex, whether with a man or a woman, are violations of the third precept regarding inappropriate sexual behavior. Longchenpa, the 13th-century founder of the Nyingma school, citing the 3rd-century Mahayana texts of the Indian master Asanga, elaborated that inappropriate sexual behavior also include the hands among inappropriate parts of the body for sexual activity. In the same way, Gelug predecessor Je Tsongkhapa also adheres to such rules in his studies.