You're probably joking but my Granddad had a dairy farm in San Joaquin Valley California in the 70s and 80s. My cousins and I would have great fun with his Double Cow Fixed System Model TT2....LOL. And to top it off he also had with it a motor and vacuum Pump so it made for one simple switching for turning it on and off. To this day I love sexual adventures with objects and such. And of course I love real dick.
A few years ago, I emailed with a couple (Pasco County, Florida) who had a machine for, I think, 8 guys. Unfortunately I moved and lost touch so was never able to be part of it. Would be happy to do so now if they or others see this.