Male rectal exams in the 1970s

I worked in a factory owned by a large company in the mid 1970s. To be hired we had to submit to a physical exam and every year afterwards, or go to our own doctor and pay for it. I was 18 when hired and most of the other people were around my age that got hired. Even for an 18 year old the exam included the rectal exam which the majority of us had no clue about before going into the exam room which was on site. No gown or anything the nurse had us strip and wait for the doctor. I saw the gloves and KY jelly on the table along with other stuff, so I immediately panicked, knowing something was going up my butt not sure what. I had been given enemas as a child and a bad experience in the emergency room when a doctor cleaned me out manually with his hand. So in comes the doctor and he does the regular stuff with me nude in front of the exam table, the does the hernia check and takes his time examining my penis and balls. When he finally stopped I thought it was time to go, but he asked questions about my rectum at this point, if I’d had any sores or hemorrhoid problems. At this point I said no and also that I did not need an enema. He then informed me that he was gonna do a good rectal, so I figured it out, his huge finger was going in my butt with a gob of KY jelly. His hands were huge and fingers were long, round and thick. I was young and skinny with a tight round butt and this doctor just seemed gay to me the way he was looking at me and my dick, so I was terrified. I watched as he put a huge gob of KY jelly on his gloved finger and a line of it down his finger. I turned around and bent over as instructed and put my elbows on the table, with my legs spread a bit. He opened my butt cheeks and looked in and it made me feel dirty, like I was being ogled. He looked up in there so long I thought he’d changed his mind and I looked back over my shoulder and then felt the lube on my butthole, so I turned back around. He eased his huge finger in and mostly I just felt the KY, until he went further and explored me and it stretched my tight hole open. It was uncomfortable