Let's put the answer straight out. It's something only older kids, teens, and adults should know. It's unwilling sex. Don't ask your parents. I never asked anyone what anything is, I just found out somehow. People think I'm innocent for some reason, though.
If the real world actually was like that, everyone might do everything, and we'll fall in world war 3, and then... KABOOM. The planet would explode because someone had a permission slip from their mom...to explode the planet.