What is the meaning of SM?
S=Sadism the giving of pain.
M=Masochism the taking of pain.
So who is into SM?
Turns out that every time you scratch an itch, it's a mild form of damage to the nerve cells under your skin. The same kind of damage that happens when you take pain.
So that means that every person who scratches, is giving pain (S) and taking pain (M) at the same time!
The whole world is full of SM'ers, and they don't even know it!