Suck, Lick , Stroke, Rub
Rub eachother's penises until white fluid called AIDS comes out, then they drink it & repeat.
Penis docking is when you rub your penis against another, like rubbing two penises together. actually, that is technically frottage. Docking is when a penis is inserted underneath the foreskin of an uncircumcised man's penis and the two are rubbed together.
The force that slows or stops motion when objects rub together is called friction. Friction occurs when two surfaces are in contact and it acts in the opposite direction of the motion, creating resistance that opposes the movement.
A place where two plates rub together is called a fault line or a plate boundary. This interaction can lead to earthquakes and volcanic activity as the plates move against each other.
Static Electricity!
That act is commonly referred to as "tribadism" or "scissoring."
That sound is called a pleural friction rub and is typically heard as a grating or rubbing noise during respiration. It is often a sign of inflammation of the pleura, which can be due to conditions such as pneumonia or pleurisy.
Hold? if you mean rub, boys rub their penises because it feels very good. Holding it maybe because it makes a boy feel powerful or impressive to be reminded of his own "manhood"
Friction makes things (like soles) rub away
The force created when objects rub together is called friction. Friction occurs due to the resistance between the two surfaces in contact, which results in a force that opposes the motion or intended motion of the objects.
You can feel heat when you rub your hand together!