NOTE: This is a very brief version of the 25 page PDF on the subject. The free 25 page pdf download on the third precept is here. Theravada Buddhism and Sex (extended) Summary: The third precept is defined as not having sex without the protector’s permission. It is that simple! However, the protector can be the parents, husband, guardian, brother, government, religious order, etc. You need the protector’s permission and often that is the parents in most cases.