All you need is a hallway, a rolling chair, and a willing girlfriend.
The girl sits down naked in a rolling chair at the end of a hallway, and the man climbs on top of her, upside down, and they begin to perform the "69" on each other. When he is about to cum, he slides down her body and sticks it in her front for 3 good thrusts counting down (3... 2... 1...) then as he cums on the third thrust, he simultaneously slides all the way off, kicks the chair hard, and shouts "Lift Off!" as she goes rolling down the hall with the his cum leaving her like flames out the bottom of a space ship.
I had to get the carpet cleaners in here to clean my hallway because I gave my girl the Apollo 69 last night.
(adj) Describing a question the has an obvious answer, one that normally relates to sex.
Girl - Do you want me to set up a camera while I'm taking my bath?
Guy - Is that a clitorical question?