I had an experience at a regular check up with an urologist new to the area. He was covering for my regular doctor and noticed that my PSA was elevating. He asked if I was experiencing any difficulty with urination and orgasms and I told him that there were times it was painful to empty out and orgasms just didn't feel as intense as they used to be.
After a chat about aging, the looked over the results of a urine sample I had given them a could days before. He said there was some evidence of an infection and asked if I had been sexually active since my last visit (three months prior). I told him that I had not had any anal sex, just oral.
Every visit I have the prostate exam done. He asked me to get into position...but to remove my pants and briefs. Usually I just drop them down to my ankles. So I slipped out of them and assumed my regular position...but was asked to get on the exam bench on my elbows and knees.
The Dr. told me that he was going to do an exam to check out the prostate. He slipped on a glove, lubed it up and entered me slowly. He probed around for a bit, mentioning that the prostate was enlarged (been that way for a while) but there were no abnormal lumps. He then told me he was going to press on a spot and to tell him if there was any pain. When he pressed, it felt like fire was shooting out of my cock! He told me that when a prostate is inflamed or there is an infection, that is a normal sensation. He said that it could be a combination of age, infection, or chronic inflammation but the best way of knowing is to have a sample of prostate fluid to be examined.
All this time, his finger was buried deep in me. He asked me to hold a cup under my penis to catch fluids that drop out. He started working the prostate over, swirling, pressing, and rubbing it. He kept this up for 3 or 4 minutes, all the while asking me if the pain was subsiding. It was and replacing it was this immense wave of pleasure. I had to keep moving the cup as my cock grew hard! I sensed that there was something leaking out of my hard on and after a few minutes, I had given the sample needed for examination. He handed me some tissues to clean up, told me he was done and to get back into my briefs and pants. When I slid off the table, I swung around to face him with my still erect cock, dripping with a milky white fluid from its tip.
A couple days later he called me to let me know there was no infection and the cause was probably some type of activity that caused the prostate to become irritated. I do ride a bike on a regular basis...he said it was either time to look for a new activity of wear bike shorts with heavier padding.
That's my erection at the doctor's office...and I have had a couple of other instances of surprise boners during there exams to check out suspect areas of my prostate.