Alright listen up.
When a mommy and a daddy love each other very much, they often play a special game together. This takes place in bed. You might hear them sometimes if you listen very carefully. This is a very enjoyable game which only mommies and daddies can play.
The mommy has a special part called her womanyjibbit. The daddy has a snake erupting alien-style from his abdomen. When a mommy and daddy love each other, these two parts come together in a special hug. We call this hug nnnngh.
During nnnngh, the daddy's snake leaps into the womanyjibbit erupting little tadpoles into the mommy. Mommy uses these tadpoles to create a thetan.
Eventually this thetan grows into a game.
I think so, anyway.