Yeah, it happened to me about 25 years ago. I am not sure whether I have written about the experience on this site before, so I will describe it here. I was referred to a radiology clinic for a gastrografin enema. It is very similar to a barium enema except that gastrografin is used as the contrast medium instead of barium sulfate. It had been ordered by a colon and rectal surgeon who was trying to get to the bottom of my chronic constipation issues.
After arriving at the clinic, I was escorted by a staffer from the dressing room into one of the examination rooms. She told me to sit on the x-ray table and wait for the technician, who would be with me shortly. About five minutes later, the technician walks and I immediately recognize him as a young black guy from my gym. He immediately recognized me as well. We were not close friends or anything like that, but were on a first name basis from the gym. I had always found him incredibly attractive.
He seemed very embarrassed byt the prospect of giving me an enema. He told me that he would try to find another x-ray tech to do it but that I might have to wait a while. I reassured him that I was fine with the prospect of him doing the procedure. To be honest, I was looking forward to it.
He busied himself filling a disposable enema bag with warm tap water and bottles of gastrografin. It held about 2.5 liters and he filled it to the 2 liter mark. The standard balloon catheter tip was attached to the end of the enema tube. While he was preparing the enema, he asked a bunch of questions about why I was having the procedure done. He asked a lot of follow-up questions about my constipation - a lot more than I would have expected from an x-ray tech. I remember him telling me that if I was eating a proper amount of fiber and drinking enough water, I would not be needing this enema. He also asked me if I had ever had an enema before. I remember just responding, "a few" and chuckling.
When the radiologist came into the room, the tech hung the bag on a hook about 3 feet above the table and positioned me on my left side. He opened the back of my gown and lifted my upper buttock with one hand. He then performed a rather thorough digital rectal exam. I think he was surprised that I did not complain of discomfort. The insertion of the tube was routine but I distinctly remember grunting as he inflated the balloon catheter in my ass.
The exam proceeded pretty routinely at first. The radiologist would periodically tell him to fill and stop filling. They moved me around in different positions. I remember the technician having to adjust the tube coming out of my ass every time they moved me. Finally, the radiologist told him to fill my cecum. That is when things started to go wrong. The technician responded that the bag of gastrografin was empty. I think they were both surprised. The radiologist told the tech to clamp off the tube in my ass and go mix another liter of gastrografin in the bag. I remember laying there on the table with bad cramps for what seemed like an eternity while the tech mixed more solution at the sink.
When he returned, the tech hung the bag above me and reconnected the enema tube to the catheter that was still embedded in my ass. He continued to fill me, but by this point it had become really uncomfortable. I remember groaning and the tech was telling me that we were almost done. The radiologist remarked that I had a "huge colon" and that probably explained my chronic constipation.
The enema was finally over and the tech helped me up off of the table with the enema tube still in place. This part was hugely humiliating for me. What had been a fairly erotic experience suddenly turned embarrassing and painful. I had to walk from the table into the bathroom while the tech trailed behind me holding the bag and the tube extending from my butt. The final indignity was him deflating the balloon while I was squatting over the toilet. I remember him telling to stay in the bathroom for a while because they had given me what he termed "a huge enema."
The rest of my radiology visit was unremarkable. I managed to get rid of most of the gastrografin solution, get dressed and find my way home. I continued to see the tech at the gym. but he was a little more distant. I think he was genuinely embarrassed by having to give me the enema. About a month later, he did ask me if I was still having constipation. When I answered in the affirmative, I got the gentle lecture about eating more fiber and drinking more water. For obvious reasons, I still think about that x-ray procedure all of these years later.