B..
Most toddlers are that way to some extent but i dont think this is just your typical stuff. Have you ever read The Five Love Languages?
I would bet your toddler's love language is physical touch. That's my youngest's. By the end of the day I felt like crawling out of my skin! And it's not because I didn't love him but really, it was too much, lol. I almost regretted when my H touched me!
From the time he was little, he NEVER sat beside me. He always sat on me! He is my most sensitive. With this type of kid, it's very important not to use physical punishment. Just as with a very verbally sensitive child, you have to really watch your words. You could always tell when his friends had the same proclivity. They were like 2 kittens together! Funny!
Any who, I don't know of any way to train something out of one that is hard wired that way. 18 and he will still come sit in the same chair WITH me!
You have to roll with the kiddo you have!