You're right: masochism can be physical *and/or* emotional. I also think it can be spiritual.

The complement to an emotional masochist is the emotional sadist, of course. You see lots of emotional sadists online. It's a convenient way to express their sadist behind the safety (and anonymity) of their computer.

I really enjoy exploring headspaces, which includes emotional sadism/masochism. It, too, find licking boots alone to leave me feeling unfulfilled. I don't personally get too much satisfaction from that act alone. But when coupled with a humiliating or degrading emotional component? Now we're talking