69 (sex position)
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 by a male and a female, 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.