Why does my two yr old hide and hump pillows?

My daughter is two and she like sto hide and hump pillows. When I catch her she jumps up and runs with the pillow. If I take the pillow she goes crazy! She has not seen me having sex because I am abstinent and she does not go to daycare or anything to see anyone else doing this, that includes television. Where is this sudden behavior coming from? Why is she doing this and what can I do to stop her?

[tschock]

Kids do things like that. Our 10 month old son humps the pillows too. They are too young to  know what they are doing.
Everyone thought that my little cousin would grow up "weird" as she was constantly being caught putting things in her vagina...she was 3 when she started. She is now a grown woman with kids of her own...she has nothing wrong with her...and she is not sexually addicted or anything either.

If you have ever left her with someone else while you were out...then I would take her in to be checked...otherwise I wouldn't worry about it too much.