Pummel Speed

Pummel Speed is defined as the speed at which the insertion of a penis into an anus will result in the formation of third degree friction burns on the penis. This has been calculated to approximately equate to 43.72m/s.

Man 1: Omg I so want you to fuck my ass.
Man 2: Sorry gorgeous, I was drunk last night and pounded this random dude at pummel speed.
Man 1: Ouchies! That'd hurt!
Man 2: Yeah it does...