I posted about this before, but wanted add an additional experience. About 1970 I had a friend, Molly. I was her go to guy when she got horny, which was great, and so was she. It took a while for me to finally talk her into an enema, because she hated the way the felt going in. But, she admitted she didn’t mind expelling and loved how clean she felt when it was done.
It turns out she had been treated rather roughly by mom, or whoever gave her the enemas. Bag held to high, not stopping when it got uncomfortable, etc. A gently administered enema made a big difference, and i would get a request for both sex and an enema.
But, the psyche being what it is, after we were doing enemas for a while she would often ask me to be rough with fast fills and not stopping if things got crampy. We agreed on a “safe word” if things got too uncomfortable, but more often I got the request to make it hurt. She was also the first person I had vaginal intercourse with while she held the enema, which was at her request. She asked to try it, and yes it got messy a time or two, but we knew it might and had prepared for it.
But, true what she had said, she really enjoyed letting it go, just has hard as she could, she would try to explode, and once clean I might hear, “I want you to fuck me in the ass really hard.” Ah, those were great days!