Seriously, not necessarily. It can be for humiliation, inducing stress or pain in the person, giving the pleasure the pressure an enema gives, cleaning out for anal play, teaching obedience, "forcing" them to make a mess so you can berate and flog them, so many fun reasons for an enema,
Yes, as Susie says here, lots of different ways or reasons to receive an enema. I've been giving them to myself for 50+ years and sometimes receiving from an ex wife or GF. I can really enjoy and orgasm from just a regular "vanilla" enema, solo or with a partner. However, I'm a straight male switch and enjoy both giving and receiving, but I especially like being given my enemas as a sub to my wife or GF's Domme. And the exes who used to give me them were very good at being enema Dommes. The addition of the submission and humiliation from my Domme partner just makes it that much better. Real humiliation IRL is to be avoided, as it's extremely unpleasant. However, in the hands of a trusted Domme, especially during an enema, it's a great delight. As long as we're both going back to normal non-D/s roles after our session, and our D/s kink and enema fun is strictly between us, the more intense, embarrassing and humiliating enema plus other kinks that she gives me the better. Before retirement, I had a highly responsible, almost dominant position which I enjoyed, but the experience of submitting to a Domme for an intense, sexual humiliation is still extremely erotic and satisfying. Turning over complete control of my ass and bowels to her, knowing I can be as submissive and compliant as she demanded is a great satisfaction.
In our case, it was all greatly enhanced by a mixture of her narrating what she was doing to me and my frequent moans, groans and begging her to stop which we both delighted in her ignoring. At the end back in normal non-D/s roles, we'd look at each other and realize we'd both had an exquisitely intense time acknowledging and satisfying each other's needs.
Eric