1. 69 is mutual oral sexual play between to people. They can be a man and a women, two women or two men.
2. 69 can be varied, with licking of a cock or pussy added with buttlicking (referred to as Anilingus (ā'nƏ-lng'Əs) or as the slang term of "round-the-world." Lesbians who 69 are often called rugmunchers.