While I have limited recollection of my toilet training, my older sister has reminded me on occasion, of certain events. Likewise, I do have some recollections of those times with my 2 younger sisters. My lifelong enjoyment of enemas, and other anal pleasures, goes back to the days of toilet training. My mom and grandma were absolute in their demands of a daily BM and an enema or suppository was the result of any failure to produce as expected. Needless to say, I started self-administering at an early age, and still use enemas as a simple pleasure that has multiple "benefits".
While I'm hesitant to characterize their administrations as abusive, it was probably a more accepted method in the 50's. This day and age, there is little doubt that many would view the methods of yesteryear as inappropriate and/or abusive. Many of those early administrations seemed rather punitive, but in hindsight, likely were done more to reinforce the idea that regularity in BM's and urinating before losing control was a mindset.
Diapers, or a rubber sheet, were just necessary tools until each of us learned to recognize the urges and act as expected. We knew that these tools were for "babies" and tried our damndest to show that we had grown up. I tried hard to be a "big boy" and my sisters were rewarded when they were "big girls".
The enema bag, as it hung prominently in the shower, served as a constant reminder of the expectations. The subsequent benefits came about quite by accident, and those wonderfully amazing sensations and explosive ejaculations, got this kid hooked for life. While I was expected to take my enemas like a "big boy", my sisters were often rewarded for being "big girls" when they submissively took for their enemas.
I've always believed that our pediatrician supported, and likely encouraged, these methods.