A few novels books come to mind in which enemas are given.
They are mentioned in the novels of the late Canadian author Robertson Davies, in particula an experience with what is generally referred to as the JBL Cascade bag - you sit on it.
I am told that there is an enema episode in the "Peyton Place" novel, but I have never looked for it.
In Exit A by Anthony Swofford a character's girl friend uses an enema as relaxing sexual foreplay.
One of J. P. Donleavy's lesser know novels has a character who regularly gets enemas from his maid.
Any others?
----Michael, Boston