My father was the one who usually gave the enemas to me and my two year older brother, while my mother watched on reassuringly. However, if he was away, my mother would enema us - although it was clear she found it a bit unpleasant.
While he maintained a serious, medical attitude, I am completely certain he greatly enjoyed giving us enemas. My brother was a real screamer when it came to him getting an enema. I didn't get to watch, but from my bedroom next door, I delighted in the huge commotion going on in the bathroom - as he did when I got an enema.
When it was noticed we had not had a bowel movement for a couple of days, we were directed to the bathroom to "try again". If "no luck", we knew what was coming next: an immediate enema. While there was usually much pleading about not having to take one of those "awful enemas", it was never to any avail.
Dad used a red, two quart enema bag with a 20 inch F20 rectal tube. He would fill the bag with warm water, plop in a bar of Ivory soap, stick in his had and lather it up until the foam overflowed the top. Instread of KY or Vaseline, he would lather up his colon tube with a thick coating of Ivory soapsuds - which really stung going up your ass hole.
We had to take the full two quarts and hold it for a full 20 minutes - carefully timed. I would squirm, and plead: "Please stop, I can't take any more, please stop". Sometines my mother would get Dad to pause, but then I still always make me take the whole bag. Holding it for a full 20 minutes was indeed "awful". And any leaking led to swift swat on the butt - which made it even harder to hold in.
I know Dad and Mom got their enemas too, because I could see the enema bag hanging out to dry in their bathroom. From a few comments he made, I am sure Dad enjoyed his enemas, while I think Mom thought they were simply "necessary". I'm sure my gradparents also took enemas, and by references they made, had given them to my father. I found their enema bag at their house, and enjoyed sneaking in a few good enemas with it there myself.