Although being a millennial I was born in the "wrong" generation for enemas I happened to luckily be introduced to the concept by a certain Wizard I'm sure we are all very familiar with, when I was on-line as a horny teenager after parents had gone to bed. Although my initial enjoyment was watching young women being filled with water I became curious to try it myself. I got on my bicycle and rode down to Rite-Aid where i purchased my first 2qt combination syringe. I remember having trouble locating the item, but knowing for a fact they sold it, and not wanting to leave empty-handed, I asked an older woman working, in the process providing a fictitious story regarding how I intended to use the item as a prop for a film project. Looking back, I'm sure she knew something else had to be up.
Initially, my attraction to the concept was less disciplinary and more related to the sensation of filling with water and thrill of doing something so intimate to myself that was brand new foreign concept for a 16 year old. I grew up with Dove soap, so even using a good amount never really produced much cramps when I tried to do soapy enemas, I'm guessing because of the cream in the soap. Therefore, I tended to usually stick to warm water.
As I got older I discovered the disciplinary aspect of enemas by using Ivory soap and castile soap and my use of them became more oriented to this, as I knew corporal punishment was a healthy outlet for the way I am built emotionally but was not being spanked by my parents, and unfortunately did not receive my first spanking as an adult until I was around 23 years old.
This is all to say I am very grateful for my introduction to enemas and believe they have much more value than we give them as a society, because water is free, soap is cheap, and regardless of what the skeptics may say an enema has helped me feel better than before for a myriad of ailments. I believe the narrative around enemas changed prior to my birth in the 1980s in order to ensure people would not use them for their various benefits when instead they could be spending big $$$ to fix their health problems.
I'm not sure what effects using lots of soap may have on one's health, but I would think there are worse things that one's system could be introduced to. At the end of the day, regardless of what is popular in medicine, soapsuds enemas are still a procedure that is employed as evidenced by the different publications one can find when searching information relating to enemas and soap.