I didn't know squat about this subject until fifteen years ago. I was seeing a Dominatrix in Dallas. The rules she set were simple, but absolute. I'd get a hotel room and then call her on her cell to give her the room number. I'd previously arranged a time for my 'session'.
Then, I'd meet her at the door which was slightly ajar, naked, on my hands and knees and looking at the floor; in my mouth there would be two hundred dollars. That was the price for my session which lasted about an hour and a half. I usually reserved a room at the Hilton or Omni or another upscale hotel. When she gave me permission I could look at her for a brief moment before she tied me spread-eagle, on my stomach, to the bed. She must have been a boy scout in a former life because she tied me securely to the bed, each wrist and ankle.
After tying me up she would whip me and tease me and she went heavy on the humiliation. One afternoon we were at the Omni Hotel near DFW airport when she pulled out a dildo of some type (I was tied up and she was behind me) and she began to fuck my ass. It hurt like hell at first but then it began to feel great. Soon I was rubbing against the bed and my dick was as hard as it ever had been. In several minutes, I had a fantastic orgasm as a result of her fucking my ass...she was slamming into my prostate gland.
Don't knock it if you have never tried it.