Lately I've been working with a lot of special needs elementary school kids... It's a good time to be aware of who has a big bubble and who has No bubble. Some of them run up and hug on me or sit in my lap before they know my name. Others want as little physical contact with other people and things as possible, and when touched it is best to use a firm, gentle touch... "tickle" is the most similar neurological signal to "pain" and if you've got a lot going on neurologically speaking, it can get readily confused. I feel really blessed to work with these kids, and though I would feel funny asking them for hugs, I *M*E*L*T* every time one of them wraps their arms around my shoulders (if I'm sitting) or (more often) my knees.
There was one girl that kept coming up to me and smelling me today, though... it was a little odd, but it made her happy, so I just ignored it.