In my teen years, I had one amazing therapist that loved hugging everyone. He was spiritually open and loved to view patients' hobbies such as artworks and writings. And he allowed dogs to come into the building so it would calm us down.

As an adult, the most I get from a psychologist is a short hug and a handshake. Education teaches one about the ethical reasoning for zero physical contact with a client, but for the some that allow it, they understand these individuals enough that one hug once and a while is helpful. I think those that cannot establish boundaries and have extreme attachment issues (such as the ones in love with their therapist) should not be given this special treatment, though, because it would be harmful to their psyche and counter-productive. Nothing against those people but you could see the problems that may arise from it.