Jacob is starting to 'discover' himself. It's enlightening to know that your 3.7 year old has the natural instincts all 'animals' do sexually. Just the other day, we heard a loud thump on the floor above us. When we go to check, jacob is not wearing any underwear and has obviously been humping the bear on the bed. When asked, he was 'hugging'.
Mommy: Jacob, why is your underwear on backwards?
Jacob: Um. It's not BACKWARDS!
Mommy: yes it is! Were you hugging the bear again?
Jacob: No. Um, YES. I was hugging the bear and the train went through the tunnel!