I'm wondering if the pump feels good when using it? as a vacuum it would seem likely that it would feel pretty good. If so wouldn't that be a fun experiment? A scientific study of the highest caliber. We would need male volunteers to uhmm weigh in, buy a pump and report progress on size difference over a, what do you think, one year period, is that long enough? Using the pump every day.
No, it's not a masturbation thing, its science!
