It has been several years since I've posted anything or played with any of the Aneros devices that I have. I purchased the set of Peridise unisex toys years ago but seldom used them. I recently started using them to increase the strength of my pelvic and anal muscles as the muscles start to lose strength as you age (79). I had inserted the one with the largest head during this session and did many anal contractions to build strength. I worked the muscles for several minutes and decided to lay down on my back on my bed - legs stretched out on flat on the bed. I still had the Peridise inserted including the ball on the stem of the device and was not doing any anal contractions. Just laying there doing nothing. All of a several minutes my anus started to contract and release on its own. It was like my anus and its muscles were sucking on the device sending waves of pleasure through my rectum. My prostate was never involved. It was like my ass wanted what it wanted and was going after the Peridise get what it wanted. Waves after wave of pleasure centered in my rectum and anus swept over me and I could not control it. This went on for more than a half hour. It was a non-stop anal orgasm. It was much better than any prostate orgasm that I've ever had. I haven't tried to repeat it but the anal orgasm that I had, had was totally mind blowing.