Original: Sixty-nine or 69, also known by its French name soixante-neuf (69), is a group of sex positions in which two people align themselves so that each person's mouth is near the other's genitals, simultaneously performing oral sex.
Simplified: 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, simultaneously performing oral sex.