69 (or spelled "sixty-nine") is a sex act in which two people align themselves so that each person's mouth is near the other's genitals (penis, vagina) performing oral sex. The 69 position can be used in the event of a by a male and a female or two males or two females. Both people are facing opposite directions which is like the numbers 6 and 9. This is where the name "69" comes from.