Play doc or real, I love Brubaker's story. It may be a little exaggerated, but I've had the same kind of experience. A few months ago I was enjoying hands free massaging of my own prostate using a 3-ball anal hook. Over a period of almost an hour, I had three amazing orgasm-like experiences. I believe these had to be anal orgasms because they were induced solely by my hip movements to maintain several pounds of pressure on the front wall of my rectum while sliding the 3 metal balls of the anal hook back and forth over my prostate bump. I used rope, a ceiling hook, and a hook on the side of my bed frame to secure the 3-ball part of the anal hook in a stationary position a few inches above my bed in an almost horizontal orientation.
With the anal hook fixed in place, I slid toward it, I lifted my hips up slightly, and inserted the 3-balls through my anus. The hook was adjusted to just the right height to apply good pressure the front wall of my rectum by just relaxing my hips and butt to allow a small part of my body weight to hang from the hook. When I started moving my hips to slide the 3-balls back and forth over my prostate bump, the pleasure was so great that for the next hour I couldn't stop moving.
After maybe 5 minutes my pleasure level started rapidly building. It increased over the next 2 or 3 minutes until it reached totally mind-blowing, orgasm-level intensity. It had to be an anal orgasm. As Brubaker says, the location and quality of the pleasure was not the same as a normal, genitally-centered orgasm. The pleasure started in my anus and taint, and radiated up my spine and into my head. The pleasure was much more intense in my head and in my lower and central torso than a normal, genitally centered orgasm, which does have full body effects and head effects, but is much more focused in the genitals.
I was able to keep my first anal orgasm going for at least a minute, maybe two minutes, by continuing my hip movements to maintain strong, sliding pressure on the front wall of my rectum. Eventually, I began to shudder so much that I couldn't control my hip movements. The shuddering went on for a good part of a minute as I struggled to keep moving. Then the anal orgasm subsided. I thought I might have had an normal orgasm with ejaculated semen, but when I looked, there was just a lot of clear, sticky precum, (prostatic fluid), on and around my almost limp cock. The volume of my fluid emission was a little less than half the volume of my normal semen ejaculate, but it covered a lot of skin because it was so runny, (and I have no hair in that area to slow it down.)
After my shuddering from my first anal orgasm subsided, I still felt wonderful pleasure from the hook. In almost no time at all, I was moving my hips back and forth again and unable to stop because of the pleasure. A few minutes later the intensity started to rebuild, and a second anal orgasm was imminent. It started, plateaued, and subsided just like the first, and it lasted well over a minute just like the first.
After a very brief rest while still on the hook, I was back in that addictive hip-moving frenzy again. I had a 3rd anal orgasm 15 or 20 minutes later. It left me too exhausted to try for number 4.
From that experience I learned that an anal orgasm is every bit as intense as a genital orgasm, but not as satisfying. To make up for the lack of satisfaction, you don't have to wait after an anal orgasm to launch right into building up to another one. That's another quality that distinguishes anal orgasms from regular genital orgasms. Anal orgasms can also trigger amazing genital orgasms. I've never had it happen spontaneously, but just a few seconds of a light touch on my limp cock at the start of an anal orgasm will make it happen and produce an amazing amount of semen.