You want a story, you've got it!
I am trying to close the doors on what has been a 2-year saga involving an anal mishap. Prior to the incident, I really enjoyed anal sex. REALLY enjoyed it. Had it all the time. Never thought twice about potential injury or anything.
A couple of years ago, I was having vaginal intercourse with someone who had a very, very wide penis. Vaginal intercourse was painful, let me put it that way. It was huge. Anyway, we only had sex a few times, but one time he pulled out, missed, and accidentally drove that ginormous penis straight into my asshole. I cried from the pain and couldn't sit for three days.
I didn't know anything about fissures and whatnot though, and figured that when the acute pain stopped, it was basically healed. But from then on, any anal sex I tried was very painful, and I often saw blood during my bowel movements. Finally, during a regular gyno exam, I casually asked her to take a look at it. She said, "Oh my god! It's ulcerated!" and referred me to a specialist. He explained anal fissures to me and gave me a gel that was supposed to relax the sphincter and allow the cut to heal. The gel didn't work, so...earlier this year, I had to have surgery.
They put you under for the surgery, and I had a few weeks' recovery time, but overall it was a pretty quick procedure. I am physically healed, but psychologically somewhat traumatized by the whole experience. I couldn't believe that one mishap caused so many months of misery and expensive medical remedies. I've tried to have anal a few times since then, but freaked out at the slightest bit of pain. I'm hopefully going to try again in the very near future. I really want to put this whole thing behind me and get back to loving anal again!
I do believe that anal, with proper warmup, is very safe and that situations like mine are rare, but freak accidents do happen.