First I must say if you try this be careful. One day I was home alone and very horny. I have masturbated many times but wanted to try something new. My house had a central vacumm system. Several thoughts went through my head. This was something new, it would be clean, it could be fun and it could be intense. The outlets for the vacuum hose were about one to two feet off the ground. The thought of what I was about to do made me very hard.
I got completely naked and knelt on the floor in front of the vacuum outlet. I lifted the outlet cover which automatically starts the vacuum. I put my hand in front of the outlet hole to see how strong the suction from the system was. It was very strong so I was having second thoughts about putting my dick in the hole but I needed some relief.
I slowly placed my rock hard cock in the vacuum hole. The suction on my cock was intense. Within about a minute I had the most intense orgasm that I had ever experienced. Right after I came I had to lay on the floor until I stopped shaking from the orgasm. As I said in the beginning it was also clean because the vacuum sucked all the cum out of my cock.
When my wife came home I told her what I did. She wanted me to show her so I did. After I did and came again so she tried it and said it was one of the most intense orgasms that she had ever had. We now occasionally do this at the same time. The way the house is set up there are a couple of the outlets that are in view of each other so we can do it at the same time and watch each other. I am getting horny just thinking about this. Enjoy