Posing with another, while naked, in the form of a 69. Usually involves a male and a female, the female sucking the males genitals, while the male is licking, or sucking the females genitals. Can usually be referred to as oral sex
"Hey Michelle you want to have sixty nine
before we have sex afetr dinner tonight!?" says John. Michelle says "I'd prefer not to, I just want the sex"