It's very humiliating. I distinguish between good embarrassment and bad embarrassment. Bad embarrassment would be where your boss calls you into her office and yells at you in front of other employees and makes you feel like shit. Humiliation and good embarrassment usually involves some kind of exposure, physical or emotional. I like having my bottom exposed and talked about and played with.
Humiliation is a wonderful thing.
There's a small element of exhibitionism in humiliation, but true exhibitionists don't like to be humiliated. They like to show off the parts of their bodies that they're proud of. In humiliation, you get parts of your body exposed that you like to keep private. If I had my own free choice, I wouldn't walk around with the bottoms of my Doctor Dentons undone. I see the part of his personality that is fun and playful.