@ Juggy,

when your ear itches and you put your finger inside to scratch or put a cotton swab, that is also a penetration. Or when you put ur finger inside your nose, that is also a penetration. But there is no need to link it to sex. :)  When you screw something in, that is also penetration. There is no need to think about sex whenever you see a pole and a hole.

Anyways, it is sad that most people seem to be unable to think beyond sex.