dick physics 

the science that deals with the matter, energy, motion, and force of penises during sexual intercourse

Jim: "My friend told me he did sixty-nine with his girlfriend on the bottom. I told him it would benefit him if she were on the top, therefore she could have a full range of motion to suck his cock.

Joe: "I agree. That's pretty basic dick physics."

dick physics by borntobustass September 25, 2010