I had never heard even the word enema until after I discovered erotic literature on the internet at around 18. I've had a rubber fetish since 7/8, and I stumbled across anal/enema stories through looking for those involving rubber.
Sadly 20 years later, I still remain 'enema curious'. If I didn't have a duel disability (totally blind and partially deaf) things would probably have been different, but my circumstances make it difficult for me to find partners of any sort, let alone those who share my rubber/medical kink. I have no intention whatever of risking a first by myself. I may be chicken but there it is.
Beetling about online, it does seem to me though that enemas are having a quiet comeback. Plenty of enema equipment available online, no thoughts on its quality as compared to the things I've seen described in old medical books. I've seen (heard if you like) lots of enema videos, even if most of them are apparently staged. I've also seen a number of sites recommending enemas for health reasons.
It's an age where many people are searching for 'alternatives', to just about everything. There are plenty sadly who sneer at the idea of enemas, but I think there must be a good many others who... like me, at least keep an open mind. For me, I don't know if it's the idea of the enema itself, or the submition of the receiver to the giver. I adore F/F femdom enema stories, even better if set during 'the golden age'. Nowhere near enough such stories as compared to M/F, or I think even M/M haha.