Some years ago, I text chatted many time at length with a woman who was subjected to all sorts of punishments by her husband, at least that's what I was told and I have no reason to disbelieve her.
She told me of being on her tummy on a padded spanking bench, wrists and ankles attached to the bench legs, catheterized with a plugged Foley, and retaining a large, soapy enema, and being spanked with a belt, as her friends watched. Everyone got to watch her vaginal lips being spread with a speculum and the catheter being inserted while in stirrups and the enemas given.
Other punishments included being given a very strong dose of Dulcolax pills, about 6 as I remember, and being diapered and shackled to the bedpost for the night. The laxative had to be taken and she was diapered as her friends watched. Everyone knew full well what was going to happen. She was left thus long after the laxative had worked fully.
The worst, I think, was having to lie under a folding camping toilet as her friends used it and others watched. The friends were given suppositories before sitting to be sure of a full effect.
She was also required to do housework or yard work, wearing a backpack holding an enema bag connected to an inflated retention nozzle in her butt. I think some of her friends were also receivers of similar treatments. She told me the enemas were very soapy, some times with added glycerin, and the required retention times long. Expulsion was always while standing nude on a deck, butt pointing outwards into the yard.
I don't know why she put up with such treatment, but it may have been she felt she had no other options and didn't want to wind up on the street.