From Apastamba Dharma Sutras 1.9.26.8: A [student] who has broken the vow of chastity, shall offer to Nirṛiti an ass, according to the manner of the Pāka-yajña-rites. This same Prayaschitta is also found in Taittiriya Aranyaka 2:18, Manusmriti 11:119, and Yajñavalkya Smriti 3:280. How c...