It was difficult to reach an agreement because of the 'friction' between the two sides.
Oil in a car engine reduces/lessens 'friction'.
the 'friction' of sandpaper on wood
(..) and wait for ejaculation. Intercourse takes place by inserting the male sex organ into that of the female. Female sex organ! Piston movements of the hips cause rhythmic friction and the male ejaculates in ecstasy. Ejaculate! The sperm in the semen head for the uterus and the ovum is (..)2007 Kantoku · Banzai!