As far as interest in enemas go, I have maintained a steady level of interest for nearly 70 years. My actual administration of enemas has fluctuated due to various factors. When a young kid, I began self administering when home alone long enough to fill the bulb syringe and enjoy a quickie. As I began using the enema bag, the time investment was a bit longer, and opportunities diminished until I started showering/bathing without having to share the bathroom. As I reached and understood puberty, my enema use was very frequent and I could imbibe after school, nights, and anytime left alone.
As a teen, my sexual interest with a girlfriend replaced some of the need/desire to sneak enemas. Although I still used the enema bag, I found an enema could overcum premature ejaculation by having engaged prior to those other sexual encounters.
Once I experienced enemas in the hospital, from a nurse who was a friend's older sister, my interests were accelerated and those accounts in Penthouse really triggered an obsession including an equipment fetish. For the last 50 years I have been a pretty consistent klismo, and my interests have never waned. Thank goodness that they haven't interfered with an otherwise "normal" existence that included a family and lengthy career and R&R.
Few things beat a good enema, massage, and other manipulations to relieve stress and reset my gumption to carry on some more!