I firmly believe anyone who says they are not sexually stimulated by an enema are the same people who would deny they have ever masturbated! While I think our reasons for taking enemas vary widely, the erotic stimulation that comes from the sensations an enema produces is nearly impossible to ignore. It's simply a matter of how we react to them.
During my weekly appointment with the bag, my sexual component is rarely ever the same. Sometimes the thought of anal penetration and the subsequent pressure from the warm water are enough to get me started. There are times when, although I am stimulated, I am not moved to touch myself at all. Other times, I can't keep my hands away from "down there"! I have no idea why things occur this way, but simply chalk it up to the "magic of the enema".
Have fun and play safe!