I'm not a huggy person, and I almost never initiate a hug, however if s closer person needs a hug and initiates it I don't mind, and it sometimes makes me feel good too. Unless it's someone I don't know well, then it's just uncomfortable. I would probably never ask for hug from therapist and I wouldn't want him to hug me when I'm sad but he did initiate once when I was going away for a while. I think it was probably more for me than him, not sure, but it did feel right and appropriate and it stayed with me for a while
I think most of the time one person wants the hug more than the other and people often offer a hug to comfort a person, not for their own satisfaction, so I would say enjoy it if you can get it. Or maybe if it was less frequent, not every time you see each other, it would mean more? Maybe once you and your therapist got used to it, it seems more mechanical than genuine, so it doesn't have that comforting effect?