Water & Power was 'the' enema magazine for its time. I have a trunk filled with W & P magazines, and paperback books from the Dr. Guenter Glow series. Dr. Glow's books typically, or always dealt with enemas; I would say that they were more from an erotic standpoint. The may have also dealt with sensual over the knee spankings, but please don't hold me to that. It's been well over 20 years since I looked at any of them, or even opened the trunk.
And, yes, I do have a lot of erotic spanking literature (books & magazines) of that time.
There are also some Water Works magazines, and maybe a large quantity of Penthouse Letters.
Candidly, when I left San Francisco, I gave the bulk of my collection of erotic reading material to the Society of Janus, a great organization of the time, and probably still is today.
These magazines and books have been in a trunk, unopened since I moved back to Texas at the beginning of the Century. And, it has always been my feeling that if one does not use something within 2-3 years, it should be sold so that the funds can be used to purchase something that will be of a more useful nature to owner.
So, I will sell a lot of magazines and paper back books, some great reading material, if we can figure out a way to accomplish the goal. Ah, yes; there are also other magazines very similar to W & P from that period.
Let me know if you are interested; thank you.
Hermann