Human friction

[N8hn]

Does anyone know the coefficient of friction between the vaginal wall and the penis?

[fluidistic]

Strange question. I guess it depends on a lot of factors. I'm not sure it has been measured.

[N8hn]

I know it's strange. I know you have to take into account how "wet" everything is at the time, but do you know if you could determine anything else based on the viscosity of the fluids?

[Evo]

There are too many factors, so no.