cylinder size

I think this warrants a special focus upon. The post will be edited and updated as we go to reflect the inquiries. When selecting a cylinder size, make sure to understand the needs for the setup. At the same time, YOU MUST precondition your penis before going into higher pressure. Do not go...

does the size of cylinder vs penis size make any difference? and also besides the balls getting sucked in obviously. does larger cylinder affect anything when pumping?