Jizz

Increasing the drag coefficient...

gifs

High coefficient of friction

HugeDickTinyChick, LipsThatGrip

Mika Tan tries to show that the reflection coefficient is the ratio of the complex amplitude of the reflected wave to that of the incident wave and that you can increase it by attempting to make the surface of the material a more homogeneous distribution

MikaTan

Checking rebound coefficient.

ass, lingerie, NSFW_GIF

Feeling Rather Thick and Frisky...Care To Take A Seat And "Talk" About Frictional Coefficients....

dadbod, DadsGoneWild